Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f3b48f6d00993b…

MALICIOUS

PDF

78.7 KB Created: 2021-05-11 18:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 169872b1f441928c6a7a2552930fe89b SHA-1: 05564791afd20a17f12b1070c466f5269198b31f SHA-256: 55f3b48f6d00993b4f6df16a87adae7dc0fa0c13fc1964bea2e29228ff740bed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=ninja+blender+replacement+extractor+blade PDF link annotation
    • http://konolux.medianewsonline.com/10695835781.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457604/normal_600214b7528ec.pdfIn PDF document text
    • http://bonmarket.site/wogipewuwubarixez72cp.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/40585600901.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/what_is_pbl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_60600d9d1abe3.pdfIn PDF document text
    • http://getsol.xyz/3294650938769h99.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/math_worksheets_8th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_601f31d5a2800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418383/normal_602c91c03de50.pdfIn PDF document text
    • http://axecheat6.xyz/xulofueb2r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_600ae5485f87c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_af2a088befc74aa8a5eb47e0535052fb.pdf?index=trueIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_25075c3197b744f19138149f6146a15f.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_5c9e8a352f3c4a9ab9fbdc4dc26543ed.pdf?index=trueIn PDF document text
    • http://totefopige.atwebpages.com/george_adamski_inside_the_spaceships.pdfIn PDF document text
    • https://4fcc26ae-a476-48f2-98aa-cdc5c12f4544.filesusr.com/ugd/32d0e1_1e2a66f4f35644bfb6b7f8b9af553c51.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_e9b6615c3fc84aa0861a266a5fbb1e5d.pdf?index=trueIn PDF document text
    • http://jarepumemaxi.onlinewebshop.net/wenimiximomer.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_34a8ee4bb1c64e34a8c95c1f1994cbbf.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 5296 bytes
SHA-256: 127338f67279ba782da8de552c3fe129e244cedb551de667de96ddc43c130040
font_01_sfnt_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 10808 bytes
SHA-256: dbf7de0a0b73e3f898f33f7e1ef76a6b3c0f2c779a0912482ecdd2ffff3d3526
font_02_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 17200 bytes
SHA-256: 57bb265ee9926e07e47e9161ec1c3c84070a80b8e495b90c8ff97b7a4438210d

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