Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1faf146959fb487…

MALICIOUS

PDF

73.3 KB Created: 2020-12-25 17:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 005f303383ade9aa2e34ca2fd1a4393a SHA-1: 9e68595431e6553dec2a95a836cd91bc46e28c4c SHA-256: e1faf146959fb48763ad543e508a51e21db5fdd701676627c4df5b8d9c02a7ea
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a suspicious URL. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. The embedded URL and the nature of the link farm suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?utm_term=gas+meter+reading+practice+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451567/normal_5fd86b07b58b2.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/pghjbUx/75816403946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464861/normal_5fccb417abf05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_5f9ec51778d89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413228/normal_5fc711038d5bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_5f96be3454790.pdfIn PDF document text
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/sanamosux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f9d8a1f9442f.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/6386069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465394/normal_5fdfa79e49087.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/sanekufiwumafo/63059986186.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/gruber_studies_in_lexical_relations.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/83141921497.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/meiosis_vs_mitosis_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/93733739530.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/hep_c_treatment_guidelines_2017.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_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 5392 bytes
SHA-256: 09dc68f1c8fc9c7c161d9171bec7dc7c3cc7d18816e607f14bf4ea67460bc372
font_01_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 10496 bytes
SHA-256: f736f5159e0ede9ce7582f78b7607c04c4d3aafff4d1d8fdae67e825529051e8

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