Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0efb58428616eca…

MALICIOUS

PDF

68.3 KB Created: 2021-02-08 17:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d1bde15b37ab8d6411121f4171456ee6 SHA-1: 426a9be41eb6b9865ccdddad8c469d19d787d82b SHA-256: c0efb58428616ecacdd7427796a7f96ac6aa71d1b0362aec67a472cdeac550be
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous external links, many hosted on disposable domains, designed to redirect users to other potentially harmful sites. The document's content is misleading, presenting itself as a licensing guide to encourage clicks on these links.

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://seumenha.ru/wb?keyword=dynamics%20365%20portal%20licensing%20guide PDF link annotation
    • https://zunepijubu.weebly.com/uploads/1/3/3/9/133986973/nosilero.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375700/normal_5fe1080a91b03.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/sejerugebiwaj.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/389917.pdfIn PDF document text
    • https://vunafenivanisip.weebly.com/uploads/1/3/5/3/135303543/turun_jogasegikok.pdfIn PDF document text
    • https://kuwupixunipava.weebly.com/uploads/1/3/3/9/133986845/lokaninufukibar-venawufa.pdfIn PDF document text
    • https://pumoguviponurin.weebly.com/uploads/1/3/4/7/134773216/kozefikobiwumu-pisetur.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/4145802.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/5aaf7f1b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_5fdb58f4612d3.pdfIn PDF document text
    • https://vajasefa.weebly.com/uploads/1/3/4/4/134490273/6414118.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvunemomot.epizy.com/nihongo_challenge_n4_kotoba_answers.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_off0000cda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA8 5936 bytes
SHA-256: fda5f71119f1e73a2c8acc3a0ec3fd0fbbcc5a52b9b312a7e5a641ce78f69f63
font_01_sfnt_off0000e1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CF 10236 bytes
SHA-256: 249a08082c2ab7c89d43962b3f137278c05c47e819ab26fa0870aed9932f0f23

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