Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9c746ee802c7b2…

MALICIOUS

PDF

73.3 KB Created: 2020-12-31 14:11:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e173941897e96ddcdd2d1af1d1fd3864 SHA-1: ea97b57bd1a440e0d8c1ba279698e16aaf773e1a SHA-256: 8e9c746ee802c7b23aad53103690ded0a62ab8fb92ec192f0983a8b5c76be3a9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with a significant portion hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=is+cos+x+or+y PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5fd2c025401e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5fad6a026aef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f8f772675620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f876375c8721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_5fbf3cd55800c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375070/normal_5feb7b33212bb.pdfIn PDF document text
    • https://wujowaditufoko.weebly.com/uploads/1/3/4/6/134696314/niwani.pdfIn PDF document text
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/feec8a.pdfIn PDF document text
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/mazimijumojug.pdfIn PDF document text
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/pigofapuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_5f8ccb67baa06.pdfIn PDF document text
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/dogutados.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/mejados/54958586130.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/19th_anniversary_gift_ideas_for_him.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65836e31-7916-4ecf-9e6f-8f82b42a7c2e/91805901393.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_off0000e182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 4656 bytes
SHA-256: 136fba662ed1abe43a84eba64943deb1b4ac88c5c7254458fcaa91e93d8ec0e0
font_01_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 11628 bytes
SHA-256: 4b00ac15c1c96698b2316ab7e87707dc14312763fd9bfb82ee7f51606f2d00ef

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