Malicious PDF — malware analysis report

Static analysis result for SHA-256 deafb5c9961d8d69…

MALICIOUS

PDF

76.4 KB Created: 2021-04-21 12:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4f6041cb106a3353f31808bee70408ab SHA-1: f50cec12a3b41f6b691855d85f31e8dd48b6b33f SHA-256: deafb5c9961d8d69d36896b632a2f76f99f01c7895615b14adaf6d9a7ff41525
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://ponafet.ru/strik?utm_term=is+wow+still+worth+playing+2020+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411922/normal_6004c44c9f5f6.pdfIn PDF document text
    • http://dirozigumifew.scienceontheweb.net/m100_performance_standards_for_antimicrobial_susceptibility_testing_28th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_5fdb81821fd31.pdfIn PDF document text
    • http://fito4ka.xyz/fitavonedowolevuginni683.pdfIn PDF document text
    • http://all-system7.club/45310081840uoygt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_5fe9260622317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_60342adb007de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_600ff50596085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_6030994d261e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5fc84c45b89a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_60421a2f48520.pdfIn PDF document text
    • http://www19216801.site/xojepijodogevumusuvuzumid59tr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_603114154e47c.pdfIn PDF document text
    • http://xonigej.mypressonline.com/9373587948.pdfIn PDF document text
    • https://cdn.sqhk.co/lumozupa/gegcbib/25508181570.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5ff89514c560f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418167/normal_5fcebe1266f16.pdfIn PDF document text
    • http://francobusiness.com/28511989319rkrpt.pdfIn PDF document text
    • https://cdn.sqhk.co/kigudukolon/jHUhjsE/bursite_tratamento.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 5628 bytes
SHA-256: 46e01dbdc847ab6ddd4ba9bfb4913742f68e1f5f8ed23c525c490b9bacfa011e
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 10308 bytes
SHA-256: f985af625d3cf5d892645d29301046bab95cb55ae2049f7f9f0ee77151bbbf60

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