Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd4e29445475f4f…

MALICIOUS

PDF

71.1 KB Created: 2021-02-05 19:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b4dc92f487ea37d9492437a4bc9511cf SHA-1: c2e2bf86c521c6b637e089947f8e54a3cef02e2f SHA-256: 1fd4e29445475f4f6641598138290ba1b69a4412795565c466697b6c8b5d6cc6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://seumenha.ru/aws?utm_term=tamasha+songs+ming.+se PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368223/normal_600c51d12995d.pdfIn PDF document text
    • https://giravegide.weebly.com/uploads/1/3/2/6/132681237/faximoragokul_lefuke_dapavola_najoboxan.pdfIn PDF document text
    • http://jazeforip.22web.org/60492582180.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/gdYZiMz/gegiderixiturolozifan.pdfIn PDF document text
    • http://bamovewube.22web.org/victoria_secret_show_performers_2017.pdfIn PDF document text
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/6772468.pdfIn PDF document text
    • https://jasefukop.weebly.com/uploads/1/3/0/7/130776564/3255718.pdfIn PDF document text
    • https://jojurofi.weebly.com/uploads/1/3/4/6/134666092/fac4173a.pdfIn PDF document text
    • https://vaxejoxumede.weebly.com/uploads/1/3/5/3/135346770/7133320.pdfIn PDF document text
    • https://lejawoxaniw.weebly.com/uploads/1/3/0/7/130738778/repisanobutegenizodu.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/fmjjgel/12383035537.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371498/normal_5fee38e4da99d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372735/normal_5ffe7d48bcbb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0B 4952 bytes
SHA-256: a313ab016fdaed685f987598b822294a352e7aabebe0961d747ec89855b1cf10
font_01_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 10184 bytes
SHA-256: 155a3c4e8d519b2b8975fc3d45dfca64045cebcef6affc9d137cfb16a92abd4e

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