Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38c06465a1df505…

MALICIOUS

PDF

72.8 KB Created: 2021-02-21 17:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 407a050d92de29f004bf8a750f81e43c SHA-1: baf691f2b5a78092d7ecef498394472195c57842 SHA-256: e38c06465a1df5051897021ab1d509803f13cb84c55538d5fadd854d453b7683
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to other PDF documents hosted on disposable domains or link farms. This behavior is indicative of SEO manipulation or a phishing campaign designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/123?utm_term=large+block+answer+sheet+sat PDF link annotation
    • https://cdn.sqhk.co/poxirowo/yjihF0c/juegos_de_boxhead_the_zombie_wars_2_jugadores.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/jatapazemizevosukile.pdfIn PDF document text
    • https://cdn.sqhk.co/liwewajawab/haX8jce/98144649097.pdfIn PDF document text
    • https://nupetumagapet.weebly.com/uploads/1/3/1/8/131859993/misenozedi.pdfIn PDF document text
    • https://kefuluseze.weebly.com/uploads/1/3/1/3/131398598/bepudasikokame.pdfIn PDF document text
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/fubiropowunar.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/c8jaCjb/waves_tune_vs_autotune.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/8025393.pdfIn PDF document text
    • https://fisezogidegogef.weebly.com/uploads/1/3/2/3/132303301/rarunisiniz-vopode.pdfIn PDF document text
    • https://cdn.sqhk.co/kavatupopum/ejejgic/nixeresit.pdfIn PDF document text
    • https://cdn.sqhk.co/jexozumumanu/ja7ifhd/7._83_hz_schumann_resonance_benefits.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/im01jhe/call_of_duty_cold_war_zombies_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/takabalal/jesCx99/call_of_duty_mobile_download_android_uptodown.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/wolina/rowdy_baby_song_sinhala.pdfIn PDF document text
    • http://nokefibazapowem.rf.gd/84959575063.pdfIn PDF document text
    • http://wuparol.epizy.com/arteritis_takayasu_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/lesovexunaberef.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/my_bittorrent_is_not_ing.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/vegomelobavozameguwosita.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/25871534789.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 5300 bytes
SHA-256: 981beafaee8750959b8488c7816d69cce38013e912e2472179a93d374a7c25a3
font_01_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10504 bytes
SHA-256: 4cf5fd534ced6b9959a624a10468f52eea34300e5ea29df3228d4b8c8ab90762

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