Malicious PDF — malware analysis report

Static analysis result for SHA-256 122dc752406d0433…

MALICIOUS

PDF

85.2 KB Created: 2021-03-02 14:10:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 32b7c2f716674a49f413e83599f42227 SHA-1: 4f6957862cae4064173ff54c51fe2aaee189aec4 SHA-256: 122dc752406d0433c9376affaf38f61bd5fe01712778d8fdd321a9d01c5934e0
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary one pointing to 'vilenefex.ru', suggesting it's part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the PDF as a link farm on disposable hosting, likely to obscure the true malicious destination.

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://vilenefex.ru/123?utm_term=50+laws+of+power+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377679/normal_603952daf09b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5fc83ade677fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_602be4dda207b.pdfIn PDF document text
    • http://probmake12.xyz/260916629325afdk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486359/normal_60129cb67aaeb.pdfIn PDF document text
    • http://storeeuro.info/canon_powershot_a720_is_manualxe534.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/Zlejiie/89319096803.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/fgdqcih/knife_throwing_game.pdfIn PDF document text
    • https://nobametu.weebly.com/uploads/1/3/2/7/132740930/zipaxuvedewavob.pdfIn PDF document text
    • https://kadimonadi.weebly.com/uploads/1/3/4/4/134491006/3863415.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fce6c44f0501.pdfIn PDF document text
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/ba7df4.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/9jhhcie/flippant_definition_antonym.pdfIn PDF document text
    • http://xawowonulop.22web.org/difoxovoka.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/pekatikisuruki/how_do_submarines_make_use_of_negative_buoyancy.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/goguvesotu.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

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_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 5364 bytes
SHA-256: 31ff46041adae5cb2d6daabf66f42de900f122b9943b03936678e4f7a0a3e93a
font_01_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 9988 bytes
SHA-256: 8b89a75ef5d002a81d79a819f26d7824d62b7d15f5431ce36b37f6ca4d176f7c

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