Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08239fb77340d0d…

MALICIOUS

PDF

73.8 KB Created: 2021-04-03 06:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8006c9be8df6d74ff711ea25a597bf5e SHA-1: e970676aef88a66d92ebe08cc2a5f7cdddf308cc SHA-256: e08239fb77340d0d185abb0f38bf50041dcc5faabd9d190bc912645887c6bcc4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://maypoin.ru/wix?keyword=klein+organic+chemistry+3rd+edition+solutions+manual PDF link annotation
    • http://waliduv.mypressonline.com/dictionary_of_aerospace_engineering.pdfIn PDF document text
    • http://tiwujatujoput.mygamesonline.org/album_jet_primera_edicion_1967.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/84926544560.pdfIn PDF document text
    • http://remontlegko.info/immunology_for_medical_students_download2n82a.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/10799667748.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/factors_affecting_fetal_growth_and_development.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_3b3f2cb6bd2243688a607d965ceddbad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99cf80d-ec78-466e-8357-107756f9f4a0/72207897849.pdfIn PDF document text
    • https://692937ca-140d-46b9-9715-018e108c1018.filesusr.com/ugd/2540a5_f37b203404f34c699db55d417b3baea5.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_701fa3c34a9743989cfa3cec00df22f2.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_3bbe6658ffc54f33b9c5aff4c545e4ff.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_0de14b4abb364442b2e1cb2d16073493.pdf?index=trueIn PDF document text
    • http://sulenovigadi.myartsonline.com/xoxoxigamebagokojedekabu.pdfIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_2e85a6d1955549a1b9762bf0e706d4c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51861107-2516-4246-8b0b-fa44743f13c8/how_to_reset_a_2009_honda_civic_oil_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a6408f-41de-4d09-a55e-122af215116f/tirirujibunigajoworo.pdfIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_b1b86cb8967b4951b0ba81ed0af566f0.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_off0000cc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC43 5588 bytes
SHA-256: e410cba64229c0febe781400a27a6454ac6143f22eadc73b0370f3c7463828fb
font_01_sfnt_off0000df22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF22 10212 bytes
SHA-256: 82fe425149b44f6ff1fa14b3f05525a35e14d88abcea6f97a6c9e4aa23af4344
font_02_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 16084 bytes
SHA-256: 29b8095464fa9501f2379a4c43ca3ba1b1df604f87f2abcbe11fa9bdafb8ec10