Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0fac5974b8ca89…

MALICIOUS

PDF

103.0 KB Created: 2021-04-28 08:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 471af0c2be7657d7326740a99daf2db8 SHA-1: 8c4cbb57162babe1114063c6395a8500babbd7f2 SHA-256: 0c0fac5974b8ca89e645c00aeaf4c39e9a8b27083fc52c4acb4c08bc221de669
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-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://dafemum.ru/strik?utm_term=the+raven+poem+with+line+numbers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402503/normal_6033d2c7c05f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472186/normal_5fe027f5b09b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490380/normal_6002e5549710a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5ff17d20835be.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/derivative_all_formulas_download.pdfIn PDF document text
    • http://kifepivukog.iblogger.org/how_much_do_interior_designers_make_yearly.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/12837236072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5e472a-ed41-4990-8eae-81e97a7b2685/41262880464.pdfIn PDF document text
    • http://rogomore.myartsonline.com/61563963283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3dadf7c-c362-4369-b1a0-0c0a49dfee4e/14402810570.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_66b09173e4294b5084aba184f417e575.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e293f02-a6b3-4cf9-8392-5f3154ef7f9f/why_does_the_nutcracker_represent_christmas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/242cbacf-a477-413e-94aa-711d74a80b84/80304789674.pdfIn PDF document text
    • http://kubowulurarekij.myartsonline.com/wexakijubujokesopan.pdfIn PDF document text
    • http://zalezir.epizy.com/aol_mail_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c5484e-1745-45b1-baec-ac4c4d8c7650/sifazevevirulemo.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/chunky_platform_70s_boots.pdfIn PDF document text
    • http://vepejiwuj.rf.gd/blurt_noun_form.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_ad2308848d1640b2a93639bf7677a3fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satulibaren/fox_channel_guide_uk.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_off000154e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E8 5300 bytes
SHA-256: abf32888aa83c520d813055274664818e2e1dba21a420e633b57541509ded725
font_01_sfnt_off000166d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D1 11172 bytes
SHA-256: 9ac0bf0c1f0a568484769cb1a024372a14d7903b9612df39f879cfb8246263c1

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