Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21760cb4e2da821…

MALICIOUS

PDF

66.5 KB Created: 2021-02-10 17:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 55d9a476569bfa99c9b544c19095fe49 SHA-1: e91b26b93d0b64f4cfb419139110567f24aa586f SHA-256: a21760cb4e2da82149a9c08b06c7fa4c229c4d283e1fc1ebdf83f1d771658c06
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript, though not fully analyzed, further supports the likelihood of malicious intent, potentially for downloading further payloads or executing phishing scripts.

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://jacksth.ru/aws?utm_term=bam+bhola+baba+video PDF link annotation
    • https://cdn.sqhk.co/somisafeg/eojiTjd/retroarch_cores_download_switch.pdfIn PDF document text
    • http://gedobitubojufu.iblogger.org/best_practice_informed_consent.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/T6idlgd/bc_lotto_slots.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/djjih96/35321995668.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/xexavejolet.pdfIn PDF document text
    • http://brumbum2.xyz/68528316734y4t8t.pdfIn PDF document text
    • https://xaxiduxaze.weebly.com/uploads/1/3/5/3/135308656/valuzifavokilejin.pdfIn PDF document text
    • https://cdn.sqhk.co/jagavibejabe/HgjGygh/sexagatisafaxedufate.pdfIn PDF document text
    • http://4escam-bot.online/deckel_s1_bedienungsanleitungi4drd.pdfIn PDF document text
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/jakaxarewulitovux.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/cigiibU/hitman_sniper_game_free_download_apk.pdfIn PDF document text
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/7579843.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/SNS73gg/need_for_drift_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/Iihjejf/35672127827.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nafabumawo.rf.gd/einstein_s_riddle_game_answers.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_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 5040 bytes
SHA-256: 656ec807f59eb1d35059523ab0cf5a71955717b1df7decbc603e162bc73680de
font_01_sfnt_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 9932 bytes
SHA-256: d42d99b941f1131a1e85542366628766924399b1fb6c8990ee44b3a66c2dbf49

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