Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c9ceb498412e7c…

MALICIOUS

PDF

77.5 KB Created: 2021-04-09 10:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 42c129af7224a52c1840197fdda60b76 SHA-1: eff86a15b709b4015d9a8d894b9b569c0eb4ae21 SHA-256: e1c9ceb498412e7c16a8bd66c4725ab669340b97a641dd41372cc9a5752d789f
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to zajinet.ru, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=excel+sheet+template+for+task+tracking PDF link annotation
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/77726ec0dd8.pdfIn PDF document text
    • http://micrometerdigital.xyz/thomas_calculus_early_transcendentals_14thciwi8.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/gcWyTjh/fun_and_interesting_facts_about_koalas.pdfIn PDF document text
    • http://f13x.xyz/arena_closer_hackdo25u.pdfIn PDF document text
    • http://dekiweragaf.mywebcommunity.org/pediatric_cervical_lymphadenopathy.pdfIn PDF document text
    • http://tramlaweq.online/what_is_critical_reasoning_in_nursingenhnp.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/hbeifig/84521069183.pdfIn PDF document text
    • http://nesobaka3.xyz/cyberpunk_2077_review_ps45ulqp.pdfIn PDF document text
    • https://ruxibotululag.weebly.com/uploads/1/3/1/4/131408142/gopuzexas-fosagejuwuzetot-gekolunulomoli.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/vipovosalemip.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/tadiguvusifun-guwufudesitafa.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/YwiDghx/wujuromodevamadilokufojik.pdfIn PDF document text
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/8a6590dee63c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bixozebaxikapos.atwebpages.com/besobuwamosadijuzelodi.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/pdf_los_cinco_lenguajes_del_amor_gary_chapman.pdfIn PDF document text
    • http://wowutuzineko.myartsonline.com/banking_regulation_act.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/midide.pdfIn PDF document text
    • http://rolugume.rf.gd/definition_of_social_work.pdfIn PDF document text
    • http://tajiroxajesolut.atwebpages.com/31774199312.pdfIn PDF document text
    • http://zakesebamorime.rf.gd/kajijedogofan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 5308 bytes
SHA-256: b7d8da83bf9597e9cbe2d188c7d46b8b39a342ac1313e38263f76ee37cd527c8
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 10264 bytes
SHA-256: 83baba57a04c0e2d5c34c1c5789e0ed7c043cb86d36229d416d411f13ccc9e9e
font_02_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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