Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b68daf7d9e1c1c…

MALICIOUS

PDF

70.3 KB Created: 2021-01-08 09:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9a04a06bc2ca1c363b8336136121ea2e SHA-1: e171eb20a876dd9d1ed2603c89136c5e3e6c2d9d SHA-256: 82b68daf7d9e1c1c0d17fb98473faf4ddbdb94ae73fa9b4ceeb40f68331bd05c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, appears to be part of a lure, possibly related to a game, to drive traffic to these external sites.

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://traffking.ru/123?utm_term=whack+your+phone+3 PDF link annotation
    • https://vefotufujipewux.weebly.com/uploads/1/3/4/4/134401009/9385877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_5fb759b583c81.pdfIn PDF document text
    • https://nokavapeselodes.weebly.com/uploads/1/3/4/6/134638024/9e95099861cc76b.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/gihjhah/abba_greatest_hits_album_download.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/7e7a39.pdfIn PDF document text
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/3db301aab50a.pdfIn PDF document text
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/6262603.pdfIn PDF document text
    • https://dosodufixelo.weebly.com/uploads/1/3/2/6/132682620/fogugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f89734a6e8dc.pdfIn PDF document text
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/3936063.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/d8fd592f-f5d2-429d-b661-0fac6faa6f3e/data_mining_concepts_and_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/40168576389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f268646-d124-4d28-8076-80fbebe90eb9/72904546774.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_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 5156 bytes
SHA-256: 846436515bef38f0121474f04a43dd3dea3abbd13bf5f4dc675ffd05ae59ac0c
font_01_sfnt_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 10808 bytes
SHA-256: 70393a8c50a60acdf56256c16436714b6729cc7d953de3e182cd2a1016e1aed8

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