Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49f42b53ce9888a…

MALICIOUS

PDF

73.5 KB Created: 2020-12-11 21:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d8517e5f92c7cd417c87c87c3a3aeabe SHA-1: 1096b92ba0bb184b56c3722ab62fd679d09f3d90 SHA-256: a49f42b53ce9888a2fbf9e6ace91961043184de3336605c8a7caa9e5e73adf02
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content.

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://trafffe.ru/123?utm_term=hp+pavilion+x360+11.6+review+2019 PDF link annotation
    • https://bafixexewav.weebly.com/uploads/1/3/4/3/134352321/e6b8ee77cb.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/lafomu-fowesutom-dabikituduxun.pdfIn PDF document text
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/a2534913d593f.pdfIn PDF document text
    • https://gujibimusexuwub.weebly.com/uploads/1/3/4/0/134042380/87ea3.pdfIn PDF document text
    • https://kebekeloku.weebly.com/uploads/1/3/4/6/134639455/339976.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/5606f26d6e6.pdfIn PDF document text
    • https://vatalinonabalix.weebly.com/uploads/1/3/4/2/134234662/tevunezojunalet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f1dfe9fc3622d5225d5f/t/5fc28852bc819f1cf42abf37/1606584403379/87728198172.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58e295687f52b6ba0bfae/t/5fc6c1d31d106d256bac1f79/1606861268236/zigalipukowegox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/397c6d4a-928d-430e-a76f-c5123a414862/minecraft_skins_sunglasses.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53c8cab79f442f245fbca/t/5fcbb6b49d29b56e4d08d58e/1607186100836/samsung_global_goals_review.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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 5648 bytes
SHA-256: 9a30c4775ed8a3b18a6d3fce322dcd95cc5ef71766783aeb17ff0b9e36dd002f
font_01_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 10768 bytes
SHA-256: f1bd35091d245e5998a2fca54258843d69ae4730e170ed0655cbeb87d8801bd3

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