Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7437895c93950c6…

MALICIOUS

PDF

76.9 KB Created: 2021-04-04 16:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7ca1b133e9b61ab92da1ef3a202bf90c SHA-1: ca6a8f2ab4a4d2d0f1d680d0c983f8dc5f5e786b SHA-256: b7437895c93950c6a8242e7f455095833fa7d597fccba587ca75fa167c9f032c
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious destination. The document body, though heavily obfuscated, contains references to 'Bsf questions and answers' and the wkhtmltopdf tool, likely a lure to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=bsf+questions+and+answers PDF link annotation
    • http://lesagotefawa.22web.org/76423925915.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/xuviwozi.pdfIn PDF document text
    • http://lozuzaragujeb.mypressonline.com/1439071106.pdfIn PDF document text
    • http://wugafis.66ghz.com/free_template_intro_after_effect_cs3.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/mudeminelirevararop.pdfIn PDF document text
    • https://daregunomunozo.weebly.com/uploads/1/3/4/7/134723938/kajale.pdfIn PDF document text
    • http://zoxatib.iblogger.org/tamil_meme_templates_free.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/22628961211.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/ontology_textbook.pdfIn PDF document text
    • http://vafutixon.22web.org/accords_piano_position_doigts.pdfIn PDF document text
    • http://mevesepegubisis.scienceontheweb.net/vetuxefuzewabixudigisasa.pdfIn PDF document text
    • http://wafixevewitope.mypressonline.com/ruvapadujuzonu.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/12575989247.pdfIn PDF document text
    • https://ranezilipevag.weebly.com/uploads/1/3/5/3/135392607/22825b5.pdfIn PDF document text
    • http://kuworekokinig.medianewsonline.com/que_viva_la_musica_andres_caicedo_descargar.pdfIn PDF document text
    • http://lexanizisujufum.66ghz.com/lupowiw.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/depovisepuf.pdfIn PDF document text
    • http://joxopenizimili.iblogger.org/10262795119.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://remabinamuv.rf.gd/sovipugosabelimapijiza.pdfIn PDF document text
    • http://tefabonapo.rf.gd/vogumapakejeki.pdfIn PDF document text
    • http://senesijosezetu.myartsonline.com/94454134959.pdfIn PDF document text
    • http://nujudibixixiri.rf.gd/how_to_enable_adobe_flash_in_chrome_settings.pdfIn PDF document text
    • http://xunudijumo.myartsonline.com/17450731787.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/vanity_fair_2004_movie_watch_online_free.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_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 5136 bytes
SHA-256: 05e12507753a8223ca09a26cece78827dc9ad2ef9b35559802f38688872b28bf
font_01_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 10512 bytes
SHA-256: eff25ca8319340fda840ae8241d497f0f57e23f8218c3049bc613a446dbb9366

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