Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33193476b527c54…

MALICIOUS

PDF

86.8 KB Created: 2021-03-26 14:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b74b716936aeb0b38ffbd4d6c28eadc9 SHA-1: 53ba1274e1de52c2c1121a7d97761be7625931a0 SHA-256: b33193476b527c542c74b3d508ca15782836629568cc2b1fd0fd57ca7898656c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://dafemum.ru/strik?utm_term=thrustmaster+ferrari+458+spider+racing+wheel+for+xbox+one+best+buy PDF link annotation
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/5761003.pdfIn PDF document text
    • https://sisuveraxom.weebly.com/uploads/1/3/2/7/132740665/medifux.pdfIn PDF document text
    • https://vuwonogi.weebly.com/uploads/1/3/5/3/135300132/2118905.pdfIn PDF document text
    • http://kidufamipowanot.mywebcommunity.org/guxob.pdfIn PDF document text
    • https://gileledera.weebly.com/uploads/1/3/0/8/130874536/0d15a616f64.pdfIn PDF document text
    • https://wuzafonufiza.weebly.com/uploads/1/3/4/3/134341979/pizebepinelelubu.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/824674163.pdfIn PDF document text
    • https://tasoxagizuj.weebly.com/uploads/1/3/4/7/134734804/cf33ef38c75.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/genizibisaku.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/71866428558.pdfIn PDF document text
    • http://guparob.mywebcommunity.org/48656213588.pdfIn PDF document text
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/8affb7.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/wesun.pdfIn PDF document text
    • http://zixaxagewan.mypressonline.com/augusto_roa_bastos_hijo_de_hombre.pdfIn PDF document text
    • http://tavegumata.sportsontheweb.net/1613031520.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/7MJhfTa/minoxinapipawitofaw.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/gjbPhqY/raspberry_jam_recipe_with_liquid_pectin.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://lumosaneja.onlinewebshop.net/vobajorebinetigola.pdfIn PDF document text
    • http://jomupaz.myartsonline.com/xusaloxanupi.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_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 6208 bytes
SHA-256: 39d4782a909a7533e49a729772dfcf8f781764db7490c4e9b48c7953c8774ca0
font_01_sfnt_off0001154c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154C 12184 bytes
SHA-256: be5996dff033c9f16aa3cabc6b8961ddc1df706bd3f5a60d35c1a2275af63183
font_02_sfnt_off00013d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D48 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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