Malicious PDF — malware analysis report

Static analysis result for SHA-256 4322128d866d83a4…

MALICIOUS

PDF

79.3 KB Created: 2021-02-11 22:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4512042e28cbd1e0c8fb647c0ec22129 SHA-1: 8bd906e234555b3b2ba10e8e04d9ac23ada1bf1e SHA-256: 4322128d866d83a4132fc759c3b866cbd7e03817a7398d07ea7e1fcacaff76f3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/wb?keyword=cerato%202010%20manual%20fipe PDF link annotation
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/b049197ea29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446643/normal_5fca2cc57026d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_6024c6d2745ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476294/normal_5fe1d26b79528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_600fcede74107.pdfIn PDF document text
    • http://theandyhong.com/71674810438gffl0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_601177f8c519f.pdfIn PDF document text
    • https://kefawefixak.weebly.com/uploads/1/3/0/7/130738991/b17c6ce31.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/hgZq3jc/nutatux.pdfIn PDF document text
    • https://pejifote.weebly.com/uploads/1/3/5/3/135348690/6172741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463272/normal_6005fdccb3909.pdfIn PDF document text
    • http://freehookup.xyz/52263038648m3lkh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5ffe44a222480.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/1TThgg9/giluzanunusa.pdfIn PDF document text
    • http://ewop.space/dog_fighting_michael_vick_videossk799.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/zubata/23136193827.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_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 5100 bytes
SHA-256: 1c1e20842c31e3050d0a5d86c23ef29236c91ce97e2be718ca136f8080b3c19b
font_01_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 16260 bytes
SHA-256: 1998ed3feb4b2517b59fd51364a4cf9a1872d4ab8a5ee4ab06c9114f2ea9665c

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