Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7477d9aaf8cff3…

MALICIOUS

PDF

79.9 KB Created: 2021-06-12 03:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 98d97c229e0bb88de70a7624177258dd SHA-1: aea5d5da3ea6c657ce10ade34f865c37e2d26866 SHA-256: bb7477d9aaf8cff3ebe73281b3438b6492c960f6dbab803920c7d1a0acb1ecd2
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 0.9998

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://crysiq.ru/pbw?utm_term=definition+of+verb+tense PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411231/normal_6000273b41a5e.pdfIn PDF document text
    • https://satatemusuk.weebly.com/uploads/1/3/4/3/134311800/sajosalimem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_6049a4e62ebbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365652/normal_5fe10f70963df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_605efe0a4acf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486742/normal_5fc8f2e167af4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_603d12dc485e9.pdfIn PDF document text
    • https://nidupivulef.weebly.com/uploads/1/3/4/0/134042353/xezal.pdfIn PDF document text
    • https://panenojaro.weebly.com/uploads/1/3/4/4/134482399/89057b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_60c2f2e589b58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461777/normal_60226f48967e9.pdfIn PDF document text
    • https://wajeditaveva.weebly.com/uploads/1/3/2/6/132696335/5463064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_5fd8e293f0329.pdfIn PDF document text
    • https://topudamix.weebly.com/uploads/1/3/4/5/134581811/sekod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497359/normal_602a6bdacd187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_60c3dd3199d6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374520/normal_6007ff78e01a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490949/normal_604351877df4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://barumena.pbworks.com/f/gun_mayhem_2_unblocked_games_hacked.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144413832/76217963152.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_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 4716 bytes
SHA-256: cd26496598d1b953edf94f2f8d168bbf4a761d89c08cc8618d1c86e58229dba2
font_01_sfnt_off00010d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D36 10880 bytes
SHA-256: 8e2b49ea2f23d40b848af2d0bb8af6f576cfae42709120a0edebee3dc701b16c

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