Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aca868f911addf0…

MALICIOUS

PDF

74.2 KB Created: 2021-06-07 03:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d07c8b5279ed9b4c12a3e08bf6d90358 SHA-1: 62182233817f2c1114446bb41705ada309e4b772 SHA-256: 7aca868f911addf06a6c2d5ff7cfc4429fb18312fc101a700ac2bbac5776f26e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://maypoin.ru/wb?keyword=how%20to%20reset%20a%20washing%20machine%20samsung', is embedded within the document body, indicating a lure to a potentially malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wb?keyword=how%20to%20reset%20a%20washing%20machine%20samsung
    • https://cdn-cms.f-static.net/uploads/4369187/normal_6056c9fabf688.pdf
    • https://cdn-cms.f-static.net/uploads/4426677/normal_6027728612275.pdf
    • https://zosojelukik.weebly.com/uploads/1/3/1/8/131871698/xoxibegopoga.pdf
    • https://cdn-cms.f-static.net/uploads/4444370/normal_602f9a333a8b5.pdf
    • https://cdn-cms.f-static.net/uploads/4417214/normal_606acf5cab452.pdf
    • https://cdn-cms.f-static.net/uploads/4484818/normal_5fd6ecb970ff3.pdf
    • https://cdn-cms.f-static.net/uploads/4425229/normal_6010d679075da.pdf
    • https://wejigewaja.weebly.com/uploads/1/3/5/4/135400860/96cf0.pdf
    • https://static.s123-cdn-static-d.com/uploads/4376870/normal_60b0a8d3810cf.pdf
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/gaxajipofunapo_donejisebome_ratavoganul.pdf
    • https://cdn-cms.f-static.net/uploads/4497131/normal_60118f1b72348.pdf
    • https://salobejutar.weebly.com/uploads/1/3/4/5/134589592/aad9b80fd.pdf
    • https://cdn-cms.f-static.net/uploads/4496584/normal_604df1d4ec945.pdf
    • https://cdn-cms.f-static.net/uploads/4407747/normal_601ff19f7e550.pdf
    • https://pituxujufu.weebly.com/uploads/1/3/1/8/131856071/finuwusu_jakekepipora_fidugexeruxe_zagosewo.pdf
    • https://wifirinopemuv.weebly.com/uploads/1/3/4/7/134762260/de9b7122a557f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vazesuna.pbworks.com/w/file/fetch/144519489/xofebubexirubibipafefo.pdf
    • http://zilebunod.pbworks.com/f/halo_free_download_unblocked.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e480.bin
6dee934f2654d309c9890caef03a030314a01f9c23c0ce00697a2311a56bd78f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 5236 bytes
font_01_sfnt_off0000f633.bin
e29582dd0b3f5cd794135a900675d4ff3c1e19b4240bd45d6a04d165dac42f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 10788 bytes

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