Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df829deba6979af…

MALICIOUS

PDF

76.3 KB Created: 2021-02-21 11:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e2f959c2063b7a6530ceb91d23d46c5f SHA-1: 965e3e036a696a372b9da2a46e86161a279768cb SHA-256: 7df829deba6979af5807e4f08c894b4af301ddc8f507ced617faf40994c864df
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://druttle.ru/strik?utm_term=when+is+the+new+hunger+games+coming+out PDF link annotation
    • http://fbdirect.site/52172905825v04ju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_600fe007aa695.pdfIn PDF document text
    • http://starconflict-game.ru/balu_mahi_full_movie_300mb_freewieoq.pdfIn PDF document text
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/1736035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451229/normal_5ff31cbfaaa5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_60289bb506193.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/jchfjdM/blockchain_wallet_fees.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/nabavesexuvesaj-nineje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465701/normal_5fe6710182a20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5ff5e13953b32.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/hdhfjgY/77034832389.pdfIn PDF document text
    • http://tells.fun/watch_guide_gentleman_s_gazettewwns0.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/0a389d87caaa21.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/sutawowirosuvuv/microbial_contamination_of_well_water.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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 5288 bytes
SHA-256: 5cce142bcb984fdc4e527ae4145ee4e90683da2bf68a2e29d45da846a7de338c
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 10508 bytes
SHA-256: 27a49ecce031166dc62fc08e04dce8ce55fa41976054774dd0c2a4138c9598a7

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