Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c94e9cac87deb3…

MALICIOUS

PDF

77.0 KB Created: 2020-12-18 12:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c256ccca7f9ade47bb5f3af18cc572a3 SHA-1: d0133d321e440b1d1ffe236fa140ff72a699f78c SHA-256: 25c94e9cac87deb3fb5aca7d4cf3f5a92c028d719ed26f2285f5a13cc91fbb7c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, suggests a lure related to a 'user manual', which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffe.ru/123?utm_term=3dr+solo+user+manual PDF link annotation
    • https://petavigavixate.weebly.com/uploads/1/3/4/4/134459614/8a86c18bfb06.pdfIn PDF document text
    • https://jolezutixuzusav.weebly.com/uploads/1/3/4/6/134605000/bc879931.pdfIn PDF document text
    • https://revokaraso.weebly.com/uploads/1/3/4/3/134320841/mumilipop.pdfIn PDF document text
    • https://getariko.weebly.com/uploads/1/3/4/9/134904460/manasiwuraj.pdfIn PDF document text
    • https://wazafalesozem.weebly.com/uploads/1/3/4/4/134498636/7467880.pdfIn PDF document text
    • https://tujulita.weebly.com/uploads/1/3/4/6/134687611/fobiluzulixu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd799159-8f10-4c45-b8ab-2904b9d43e4c/ponupoberekebifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45248f00-49f2-423b-88ac-d66f1e7b9894/phrases_and_clauses_worksheet_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/58986748276.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/47818030916.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/31783464705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7102ad63-7d7b-4816-b380-74f16023b317/xelebapefizarekupupenak.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_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 5040 bytes
SHA-256: 4ea29ec24168923a385aed64f8a9f3c96997018abcc283934d5febb1ade0fd16
font_01_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 10704 bytes
SHA-256: db6945f58037fcf0d7335f339158267f49ec72710cee1e6b501cd8bdaf1bcb30

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