Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f086120445b0c6a…

MALICIOUS

PDF

79.1 KB Created: 2021-06-11 20:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5b0a0f05e8943d9f119196b32ba8c76 SHA-1: a1db18eddccb500445e3c87ef84dd84b01720c27 SHA-256: 4f086120445b0c6afd0e47b5f5cd44b663d30de92344cdf6e26390a702a8cc7a
186 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 0.9996

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://nipisod.ru/123?utm_term=backgammon+game+free++for+windows+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369191/normal_5feba08f4ab75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451356/normal_5fca4af97f1f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_6052f5b18c98d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482631/normal_5fc956500e207.pdfIn PDF document text
    • https://xedonafu.weebly.com/uploads/1/3/4/4/134486379/xiwamefonoma_wopegino_vafesezujimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417030/normal_605a018f3264e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_60004ef39379c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_606ca53675224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368969/normal_5ff15af0636bf.pdfIn PDF document text
    • https://fegenogo.weebly.com/uploads/1/3/5/9/135981842/bugegegubaxuvepetovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492593/normal_6069118bc2fa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_606346cb30747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482009/normal_6036f68c9ba6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_605f44a903881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448331/normal_600d67ba83626.pdfIn PDF document text
    • https://pavonaxasove.weebly.com/uploads/1/3/5/3/135310158/933775.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/950622ef-66fd-45b2-8215-e538bf8011c8/public_health_101_healthy_people-healthy_populations_free_download.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/53877790090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7667cca-6c1d-4d7d-b3fe-2ac8c85743eb/nixon_time_teller_p_matte_black_surplus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e6b36f-8d99-4f1c-8337-9dc82f0f2ec5/amazing_grace_piano_sheet_music_advanced.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/how_do_you_workout_with_broken_wrist.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_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 5592 bytes
SHA-256: 25a6d539e8026b7dd55aa094dfedffd82c703ae0a394390e2f852f7d0f945856
font_01_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 10688 bytes
SHA-256: ba1f2458d8cb64904405abfa52806cf7801b7979793115e0077cdf4e20b3497f

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