Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb97a9ec8becabe2…

MALICIOUS

PDF

82.7 KB Created: 2020-11-11 11:18:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 241d0d9c53cc502d4a4784570a626880 SHA-1: 9516192d57c06cccc14839927b227907be4841bf SHA-256: cb97a9ec8becabe2398bc54147ad976e1b6d46360f012f48cef6537f686fdefb
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-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.
  • 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://traffine.ru/123?keyword=watch+dogs+trainer+1.06.329 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5f9747ed99394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_5f9a4bf69f431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f8cc1f324f8c.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/pusomi.pdfIn PDF document text
    • https://lerinajivawexof.weebly.com/uploads/1/3/4/3/134327174/84722127678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_5fa8dd282900d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382186/normal_5f8bcad87a7bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_5f8863f043824.pdfIn PDF document text
    • https://pefikasulanak.weebly.com/uploads/1/3/4/3/134350375/dedifezebiza_luvasumonaf_judabu_jobuwamubavofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480584/normal_5fa995fb08215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5fab99c9c9f1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416669/normal_5fa15f88565c1.pdfIn PDF document text
    • https://ganubosi.weebly.com/uploads/1/3/4/5/134506756/fac10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f876aa87c7d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rebomedug/odyssey_of_the_mind_division_1_problem_3.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/kamuker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c966f9e-f14e-4314-818f-8f90b80948ac/pumomopora.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 5804 bytes
SHA-256: 8befe5ae12311e4af02dbb600d328f5440491ff7f19b6ca610d8382bfe052d8c
font_01_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 10656 bytes
SHA-256: 26e4a47bf1882dd9bf0a106051a88212a07aa6758c7db8b911efee18c80ff746
font_02_sfnt_off00012f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F44 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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