Malicious PDF — malware analysis report

Static analysis result for SHA-256 869453b81453a7bc…

MALICIOUS

PDF

86.6 KB Created: 2021-01-16 08:35:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4377793c3037ed5c684eee4d3adbe2ed SHA-1: c373d332fb50839b93c1f187c1b0b8e7d9c2fd06 SHA-256: 869453b81453a7bc6b57ca5266560e0b78f8c27545f01283375e37d68b76bc61
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the document's primary purpose is to redirect users to malicious or scam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=computer+hardware+skills PDF link annotation
    • https://lorebigida.weebly.com/uploads/1/3/4/3/134377432/panezibu-niboka-bugalikadil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419437/normal_5f9c36d1bd991.pdfIn PDF document text
    • https://site-1168346.mozfiles.com/files/1168346/48859218230.pdfIn PDF document text
    • https://site-1178650.mozfiles.com/files/1178650/35594645117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420764/normal_5fddbf449feaa.pdfIn PDF document text
    • https://site-1174218.mozfiles.com/files/1174218/extreme_car_simulator_hack_version.pdfIn PDF document text
    • https://rotafejejulivis.weebly.com/uploads/1/3/4/5/134599198/kegawevabalinujenuda.pdfIn PDF document text
    • https://site-1176487.mozfiles.com/files/1176487/3d_anatomy_atlas.pdfIn PDF document text
    • https://site-1178414.mozfiles.com/files/1178414/3006340300.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460968/normal_5fc6b985a64ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_5fbd7c810dad6.pdfIn PDF document text
    • https://site-1168140.mozfiles.com/files/1168140/21852792266.pdfIn PDF document text
    • https://site-1178590.mozfiles.com/files/1178590/42070183716.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 5260 bytes
SHA-256: 57208deea26c35afeb67dde8d6d50f21a1420eab3d9293e6c97479abfc0d657f
font_01_sfnt_off0001296a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296A 10692 bytes
SHA-256: 656f3fbec228ae784b5a463837247365beb76d2d2614302869887f8573bce817

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