Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b2339641bcfb29…

MALICIOUS

PDF

90.8 KB Created: 2021-02-21 16:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a5cf62fe28a0b33630e1416b45daca62 SHA-1: 684126c6fe76d506ac1f9e7c34e534ae41d20b36 SHA-256: 14b2339641bcfb290c1d716ce0fdcf89ddd1308aa7559ca597a91a1283ffdbe3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=como+abrir+un+taller+mecanico+automotriz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422876/normal_6022cb6b2da9d.pdfIn PDF document text
    • https://gidixelasulam.weebly.com/uploads/1/3/0/7/130739099/3ec05.pdfIn PDF document text
    • https://kolenogu.weebly.com/uploads/1/3/1/8/131871799/4e1126490734b.pdfIn PDF document text
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/livudezaxelisedaxeli.pdfIn PDF document text
    • http://sotinifox.22web.org/calendario_escolar_oficial_2019_y_2020_sep.pdfIn PDF document text
    • https://debinezituxi.weebly.com/uploads/1/3/4/3/134339783/wagifoxudanulo.pdfIn PDF document text
    • https://tipuxefisabe.weebly.com/uploads/1/3/4/8/134846761/72f08651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_601b8b50d54e0.pdfIn PDF document text
    • http://wixiziz.iblogger.org/xolozedelobovebexaloz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378167/normal_5fdfa8ede7b31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5ffab0adc9ae2.pdfIn PDF document text
    • https://ledewamigov.weebly.com/uploads/1/3/4/8/134850019/2147876.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/kumezaxinoriburag.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/bokelur/english_language_paper_1_question_3_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/wavugasezoxirokasusagudu.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_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 4864 bytes
SHA-256: 5ab4cf47eb4ba96e8ef2febaea26cfc374015e8a2365af95c1c8f723a1e8b5ea
font_01_sfnt_off00013716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13716 11348 bytes
SHA-256: 5122412b841baef014cecbd4644cd9f609bb8aba4eefd177e0e27b6bed8e2537

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