Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68f8fa801f83665…

MALICIOUS

PDF

81.2 KB Created: 2021-02-16 08:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 22cee74a16cb1767e067a9cc462e22ab SHA-1: d37984b1077655b68a1cfe90673a6e9354bb83f1 SHA-256: c68f8fa801f83665e6e92269bb799bae1aa5db06a8806a8364b87898e089b3e0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, likely to manipulate search engine results or distribute further malware. The presence of multiple external links on disposable hosting supports this assessment.

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://druttle.ru/wix?keyword=entrenando+a+papa+pelicula+mexicana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416493/normal_60180768918a0.pdfIn PDF document text
    • https://tawugeri.weebly.com/uploads/1/3/4/7/134774142/zuvijimijatinageviv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5fca2e4b9e526.pdfIn PDF document text
    • https://fijomenameti.weebly.com/uploads/1/3/0/8/130874411/xumojizerivej_kanefet_mizanifineve_denogutit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5fd7f8787ed7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494883/normal_5ff4dafd6faf3.pdfIn PDF document text
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/kazixapad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5fd2892c78584.pdfIn PDF document text
    • https://pakilimog.weebly.com/uploads/1/3/4/3/134363837/sodut.pdfIn PDF document text
    • http://betabudon.iblogger.org/90002303967.pdfIn PDF document text
    • https://wozukepob.weebly.com/uploads/1/3/4/0/134017809/nukomifiditudu.pdfIn PDF document text
    • https://robivobaxo.weebly.com/uploads/1/3/0/8/130873737/8159620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366348/normal_5ff34a1b77cc8.pdfIn PDF document text
    • https://lofativunami.weebly.com/uploads/1/3/4/5/134581692/e218dc3d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dixasimoxipux.rf.gd/bedodobupotologamekatunox.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/vobitiboporofadi.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/internal_promotion_announcement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/fantasy_football_rankings_espn_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/59775676221.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_off0000e667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE667 5068 bytes
SHA-256: 3ca359789dccbbbcf716d815df23f6de6becb872f6e89591441b73530af8bad7
font_01_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 3272 bytes
SHA-256: bee38fd6a2165df1a591887ecca40c9286aaec8ad29f680d212dc767991f1a87
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 16012 bytes
SHA-256: 2a89b473f5d71c5ae94cb9859a94aabff833dafdc186cb9153b675299d3d33c2

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