Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96051d0a8b7c950…

MALICIOUS

PDF

102.0 KB Created: 2021-03-05 02:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f2288b17cefbf154e62587c7b5de74e7 SHA-1: cc524af563eeb2041613789b991471c523ef536f SHA-256: c96051d0a8b7c95033d20295f43cf6d7d24dc2b7fb8138598f38bc0a5e55cb46
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/123?utm_term=how+to+pronounce+yagami PDF link annotation
    • http://boribonabone.mypressonline.com/natoduvakudivafukukewefav.pdfIn PDF document text
    • https://vadekelovade.weebly.com/uploads/1/3/4/3/134372386/bekelabepeposifeloxa.pdfIn PDF document text
    • https://ruxesewafemowur.weebly.com/uploads/1/3/4/7/134761388/kinuf.pdfIn PDF document text
    • https://pidedofafotego.weebly.com/uploads/1/3/1/4/131438241/turizaromi_nekamu.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/savigom-komew.pdfIn PDF document text
    • https://debinezituxi.weebly.com/uploads/1/3/4/3/134339783/minokuvegedasi.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/how_to_learn_woodworking_skills.pdfIn PDF document text
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/fupuxap.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/inkscape_tutorial_vectorizar.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/80108328224.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/kimefivelizozuvukod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_4573aca5c1ac4703be3bdf33cc29597f.pdf?index=trueIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_35ab166ae28f4faeb3c971ec959a0e55.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_f6d8639e6860451db6561a387aa14334.pdf?index=trueIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_b666ea410a1c4cfcaa45540c5937b316.pdf?index=trueIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/56390924439.pdfIn PDF document text
    • http://fararisujis.myartsonline.com/wiboneja.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_6b0865acf6924d70a9feddcbfc9526c2.pdf?index=trueIn PDF document text
    • http://nejesezape.myartsonline.com/49400592541.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_064b7a59523740349190a31e7e8290e6.pdf?index=trueIn PDF document text
    • http://rabatelekovufar.myartsonline.com/mechanics_of_materials_3rd_edition_solutions_manual.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_3bbdf8cda54b430ab23d2eb5eabff586.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 6988 bytes
SHA-256: 70e82dfe36ac95ce4a5182fe541c42d2937feb21a88f0e092ccf426e8911b527
font_01_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 5200 bytes
SHA-256: a2112381b8758e798657bdac38e022e1f088a48f09327ab339b8b7d22c28e0ec
font_02_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 2656 bytes
SHA-256: c206ac4eca120f096112d408dff6b33a2f721090936d80486df636e1cd240fde
font_03_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 2328 bytes
SHA-256: 3702365b3034b9d7945da23b991b5e2ac3f8bb06d1ba3be7e5ba1b5d8dd48c9f
font_04_sfnt_off00012093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12093 2108 bytes
SHA-256: e66bd646ff29f48b94a898642357a1d5295b77faffa0bd70eb77acb4aebc9a97
font_05_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 6244 bytes
SHA-256: c66db3ac60745b96b0ac8733e16266492819f0a588dd52e9a8a9f24b72c7ef8c
font_06_sfnt_off00013a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A97 13284 bytes
SHA-256: c02a8a709438dc9bdb8690335573fbf652aff8eda41d48e2c9656dcffa0a5459
font_07_sfnt_off000163b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B7 16652 bytes
SHA-256: f621a650ce5612d7d34ad4a305dc081f92462961aba061ec77ea3a57534fcaa4
font_08_sfnt_off00017ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE6 3276 bytes
SHA-256: 51c1d5fa29146058fbc649eac7766b85490f6942bd67486bd14cc46e9087474c

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