Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e183d5f9fa06e87…

MALICIOUS

PDF

83.4 KB Created: 2021-02-26 18:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fb509683a0b0bc5029b2d6827879008d SHA-1: a9211c2e9f0cbb83382a6e1e3d2bbe845e7edfee SHA-256: 2e183d5f9fa06e875ab9ede3233926579ff85d6a30c27e6760fd1dc346d44722
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and a link farm heuristic suggests the document is designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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 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://gimoguvi.ru/wix?keyword=service+manual+ge+refrigerator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404293/normal_601d87231f723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_5fd7f7e506502.pdfIn PDF document text
    • https://pitajuzijos.weebly.com/uploads/1/3/4/8/134885257/xupomikesizi-kotedudo-waxuliz-benibib.pdfIn PDF document text
    • https://fozaxuvuten.weebly.com/uploads/1/3/3/9/133986835/9386987.pdfIn PDF document text
    • http://hermidkovo.info/352541926623e0rz.pdfIn PDF document text
    • https://jokikisiva.weebly.com/uploads/1/3/0/8/130873994/8172181.pdfIn PDF document text
    • http://rexirututesopew.iblogger.org/business_plan_exemplo.pdfIn PDF document text
    • http://ryursew.space/hulk_meme_template_tacoq5vn4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470980/normal_5ffe6bc0d613d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481841/normal_60016c5a688b8.pdfIn PDF document text
    • http://fredo.bike/9744010905521ahn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477873/normal_60049452a588d.pdfIn PDF document text
    • http://goodnatural.space/gogatoleduwizugo2r8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketened.rf.gd/rugekolubefivesi.pdfIn PDF document text
    • http://bokakemipik.epizy.com/26537067806.pdfIn PDF document text
    • http://riruzozijin.rf.gd/58787268794.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_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 5188 bytes
SHA-256: 06ae6034920d3d908c4d5d5362440a865a07114258c89e8992d3a5f280b3b337
font_01_sfnt_off00011bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEF 10704 bytes
SHA-256: 62888084fb24ca8141f75c34284bf866cccb2bb1824ca0c2c95d75753cd63ebb

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