Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22d3f0f1bb5cc3b…

MALICIOUS

PDF

70.1 KB Created: 2021-02-12 02:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f92c38906f916783e7055481541b683a SHA-1: 45cb5d8a9e81d32a0dacae82377bf0e064c6ddd1 SHA-256: e22d3f0f1bb5cc3b10bf38a0d65f5b773fac4d678a7e4a2db512359969baf114
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards malicious intent, likely to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=vampire+the+masquerade+bloodlines+outfit+packs
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5fda2a067bb33.pdf
    • https://cdn-cms.f-static.net/uploads/4383470/normal_600e065110911.pdf
    • https://cdn-cms.f-static.net/uploads/4381528/normal_60257d4543854.pdf
    • https://static.s123-cdn-static.com/uploads/4420761/normal_60089a4ccdad8.pdf
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/edd12b97f32.pdf
    • https://cdn-cms.f-static.net/uploads/4369491/normal_600f4808e5f01.pdf
    • https://cdn-cms.f-static.net/uploads/4424935/normal_5fd128874e3b0.pdf
    • https://cdn.sqhk.co/vabedesi/ngjgegi/zavig.pdf
    • https://cdn-cms.f-static.net/uploads/4403117/normal_5fe80a066c0fc.pdf
    • https://cdn-cms.f-static.net/uploads/4417643/normal_60114690d4ff6.pdf
    • https://cdn-cms.f-static.net/uploads/4446264/normal_5fd92dacea164.pdf
    • https://static.s123-cdn-static.com/uploads/4381528/normal_5ff858e606fa6.pdf
    • https://cdn-cms.f-static.net/uploads/4449779/normal_6012333125730.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xamapebonijos/6061539571.pdf
    • https://s3.amazonaws.com/xojafemori/riwuwuw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4fd.bin
aea2f18337114d34fef31f1df9aab0b80bb38ea577a9660694e03d4103a7c893
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 5688 bytes
font_01_sfnt_off0000e82c.bin
90b0cddac8478ae8541bc68ce61b92556792ff9d3f7d73c474d962b6fae56b53
pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 10184 bytes