Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a89e80e6ca2757…

MALICIOUS

PDF

69.0 KB Created: 2020-11-20 02:32:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de5888a07003801104f87793c2518aa6 SHA-1: d456d74ec49e5be46fc395f5a40c644660467385 SHA-256: a9a89e80e6ca27572fead2e961afe8b21a7da064ba620ce2de8578045d78d870
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The primary external URL, 'https://traffset.ru/123?utm_term=best+rain+shower+head+brands', is likely part of a phishing or scam campaign designed to drive traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/123?utm_term=best+rain+shower+head+brands
    • https://cdn-cms.f-static.net/uploads/4467298/normal_5fb6f0d581a3a.pdf
    • https://cdn-cms.f-static.net/uploads/4476301/normal_5fb6eda4b280b.pdf
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/zulijamib.pdf
    • https://cdn-cms.f-static.net/uploads/4387241/normal_5faaeaee5b076.pdf
    • https://cdn-cms.f-static.net/uploads/4368956/normal_5f8db73ff3d43.pdf
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f881a747074d.pdf
    • https://dufowazana.weebly.com/uploads/1/3/4/5/134529111/nonimu.pdf
    • https://cdn-cms.f-static.net/uploads/4410190/normal_5fa6ca2aaa03f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/samopakamefap/bhagavatham_malayalam.pdf
    • https://s3.amazonaws.com/jovekus/dolefizijixigibetalov.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_off0000d1ac.bin
a4f424f915ff74237947c50bf12990e449fb8718da1ce44795f1de5e9608b8be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 5160 bytes
font_01_sfnt_off0000e341.bin
260661fb5d988bfae80a61f7333613ded7a3a878e852bf82ab5f49f90f6fb62d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE341 10596 bytes

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