Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6054a6d8971a1c…

MALICIOUS

PDF

73.8 KB Created: 2021-02-21 15:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 62229016a2f4a7a068d3dca2d10232f7 SHA-1: 0ae02b017c4c831313ce9b253b609e78034a720b SHA-256: be6054a6d8971a1c47cbcb21565b44b0936ac9a5383cb059dda983cf21fb4825
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, many of which are hosted on disposable domains. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, further supporting the lure of providing content.

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://leonvi.ru/strik?utm_term=noun+worksheets+with+answers+for+class+2 PDF link annotation
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/feturivojolamuwekom.pdfIn PDF document text
    • http://lojasamericanasbr.com/drupal_webform_email_templatecun69.pdfIn PDF document text
    • https://mumasibomogavap.weebly.com/uploads/1/3/1/0/131070301/169282.pdfIn PDF document text
    • https://cdn.sqhk.co/pugijuzo/RjfigvU/47161567984.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/dDCjVij/68714667083.pdfIn PDF document text
    • http://blog-millionaire.buzz/peavey_classic_50_410_combog8a91.pdfIn PDF document text
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/madox.pdfIn PDF document text
    • http://zatoboyvibor.fun/gta_5_kurulumsuz_indirb4bz6.pdfIn PDF document text
    • http://filmera.ru/computer_application_in_business_notesyc547.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/ahgBhcY/real_followers_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/xilelawemu/ib4ifgi/21880431328.pdfIn PDF document text
    • http://biomanix.best/canon_eos_rebel_2000_film_camera_manualwkb0k.pdfIn PDF document text
    • http://espaceabone.com/94065918340hf5i9.pdfIn PDF document text
    • http://oneitshop.pro/ancient_aliens_in_tamil_freejzosj.pdfIn PDF document text
    • https://cdn.sqhk.co/sixatowitur/gchfidD/watch_leafs_live_online_free.pdfIn PDF document text
    • http://brumbum6.xyz/pomekitemojidupoxerogoiip04.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/jj7tjiP/mijonigikaguri.pdfIn PDF document text
    • https://cdn.sqhk.co/dovinokobez/hd0ggkg/tukamolameweso.pdfIn PDF document text
    • http://ctyr.ru/xogoxoxepm4ajd.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_off0000e35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35D 5228 bytes
SHA-256: eb3c19ec890bd9c4e1f5a64bd2bd5c9becaf36833846f004559107e6301a2390
font_01_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 10624 bytes
SHA-256: 0239ca9c5a63610b7230b2d5e62a317c96f73995b6f9e963a8dba3e5d731580f

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