Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4234982d801890…

MALICIOUS

PDF

80.9 KB Created: 2021-03-26 08:36:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5a17538db93996d2a842893b6e53ade8 SHA-1: efe422ee9b2cd8c8ad684319cf9967c5226d716d SHA-256: bd4234982d801890b766d817cee8ebfee8001e5adfabfe281ecdfad105603789
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of a common technique for distributing malicious content or leading users to phishing sites.

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://xezojetit.ru/123?utm_term=java+interview+questions+and+answers+multiple+choice PDF link annotation
    • https://rawebitor.weebly.com/uploads/1/3/4/3/134337567/6209665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_6028f616cb4b8.pdfIn PDF document text
    • https://fuwofinirofen.weebly.com/uploads/1/3/1/6/131637723/metopezenoba-dikap-befejabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_605c26e620db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414331/normal_602a6d641e634.pdfIn PDF document text
    • https://xajixaze.weebly.com/uploads/1/3/2/3/132302973/8573968.pdfIn PDF document text
    • https://leguwilevifemat.weebly.com/uploads/1/3/4/5/134595517/tivotariworeb.pdfIn PDF document text
    • https://motovonesavot.weebly.com/uploads/1/3/4/6/134690882/d58957.pdfIn PDF document text
    • http://mavitrade.com/jogazimaburovm2024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_600db188275c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5ff27966d3d75.pdfIn PDF document text
    • http://visionnew.xyz/academic_research_report_example3smfx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_6027236de1332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499653/normal_603ffe168213d.pdfIn PDF document text
    • http://momentikshop.space/74238811819o6o3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rilulavonepuv.epizy.com/36017641328.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/dark_souls_3_first_boss_guide_deprived.pdfIn PDF document text
    • http://rujifejoju.rf.gd/life_application_bible_the_living_bible_tyndale.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/chachapoyas_turismo.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/guidewire_connections_registration.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/toro_s_620_snowblower_price.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_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 5580 bytes
SHA-256: dc7efbde9b5ef95cb81d4dbdf5aed870b18483eebfa798620584baeba85bba1e
font_01_sfnt_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 10924 bytes
SHA-256: 81e26baf2414b6c78a4f87a833e1a0a3ced0fd282f1064902748bda2a1e4baa8

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