Malicious PDF — malware analysis report

Static analysis result for SHA-256 488adbee271bc898…

MALICIOUS

PDF

111.8 KB Created: 2021-03-16 20:27:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b975057677cdb08ccc7a52e6c1658c0c SHA-1: 990ce28c5bdd3edfa6378fb6c34847e727a85930 SHA-256: 488adbee271bc8982f292c53a871b8e565df6f161edcbb0b8129057b63f5cb5c
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 0.9997

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://vilenefex.ru/123?utm_term=fc+barcelona+wallpaper+hd+for+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392862/normal_5ff825f6de9ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423700/normal_603b25fa9447d.pdfIn PDF document text
    • http://uscreditinquiry.info/pistol_muzzle_flash9qq79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492588/normal_5fd31a62c9e06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_600dea41cea15.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/chaplet_of_divine_mercy_ewtn_audio_videoyrb4f.pdfIn PDF document text
    • http://bigtittybella.com/2051411814zgu2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_6009c2eb7e722.pdfIn PDF document text
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/gajinug.pdfIn PDF document text
    • https://gulufoge.weebly.com/uploads/1/3/0/7/130776817/xonejamujatade.pdfIn PDF document text
    • https://mesakarune.weebly.com/uploads/1/3/1/3/131380767/076a075118c77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_5fd130a75c80a.pdfIn PDF document text
    • https://bewokeramubi.weebly.com/uploads/1/3/1/6/131636949/e0fa48cd0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_adde336a7bfe4302875add0004101530.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34222ab-0552-4463-b2da-649257a3d0f8/penny_stocks_to_buy_2021_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01fce8a4-2821-4fbc-b202-a094336b9f66/which_book_is_best_for_anatomy.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_6a336f7f17f244c2ad02f35b25a86b85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/713ef642-8090-4692-90e4-c531994aa846/vogakuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/164cec11-0174-4f25-8cba-8d82367a75dc/lirovizivelitibefusina.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_f41fe21d50e641fbacda14c9ba224d82.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_ef9f0be635d6480cb8e5e00e8e0cf8d3.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17643 5252 bytes
SHA-256: 48561689418022fcf762a13d5f901e9982377597382d26c6597955afb0d9441b
font_01_sfnt_off00018829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18829 11820 bytes
SHA-256: a6c89d45762f31b2fa70fc794fe0a38a3435874ad927e1566168229bd2537e04

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