Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91e6a761753cc79…

MALICIOUS

PDF

69.0 KB Created: 2020-11-18 15:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0423afb5cb6d810d41551336f3d1b81e SHA-1: 1fe7eaa17c290c742aa40d7136073c3084cc2901 SHA-256: d91e6a761753cc7957ca63f8f67352e2c1f869903e61aa6e9f7f13218693b8f1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=the+day+the+crayons+quit+play PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f8fb8a18f30c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5f8f38b0eac75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f8e01e45deb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_5f8e7dc10a477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_5f8b0291d0c67.pdfIn PDF document text
    • https://lazekikobetilof.weebly.com/uploads/1/3/4/4/134443651/4532a3304f9b24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5fa3aa42e3bbd.pdfIn PDF document text
    • https://nusosujorogu.weebly.com/uploads/1/3/4/5/134589145/kowibowepurasajojega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5fa50928110cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f90dc72936f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384463/normal_5f8e0114431c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424361/normal_5fa01aae44ac2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca15254-a407-4bac-8fe9-8b6c053dc213/bixuzivugomapiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b96f3ae9-e20f-4f05-a7bd-2b6e75fa4736/santo_santo_es_el_seor_dios_todopoderoso_letra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b5f1315-798b-4a93-97c3-b208d0012c0b/fatuxopid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edaa323-4042-43e2-a1ff-8a6e036e7536/816-505-2523__-2212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc1b125-62e8-4089-a18f-f50090ff9b11/60268459079.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 5340 bytes
SHA-256: ced580fa62cb709ea29b753d5e2a3205a55c59af2d73975874f69675c08e7a4f
font_01_sfnt_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 10896 bytes
SHA-256: d627d1714aa1f91332227cff978ebe662350ce90c55c23ce4d45730b108ccc39

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