Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca44ca45f807af2…

MALICIOUS

PDF

84.8 KB Created: 2021-02-15 10:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a907548c3cc60d385aa8d4e6548c468c SHA-1: b740ca402efaf1a6a72d278fc0f42bfbeaac1c58 SHA-256: aca44ca45f807af2e4e1ef37dc68d5608d74ad09172294fb968d231ca64cf1c3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a guide.

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://seumenha.ru/wix?keyword=legends+of+terris+monster+guide PDF link annotation
    • http://alania365.ru/intermediate_microeconomics_with_calculus_downloadxzxl3.pdfIn PDF document text
    • http://parralax.net/79605815141qlhpx.pdfIn PDF document text
    • http://svoytrylend.xyz/602001431514sfy6.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/ggMjdK0/80445695208.pdfIn PDF document text
    • http://gogodolajukapob.22web.org/athlone_community_college_uniform.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424330/normal_5fe4153ae3c00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463272/normal_6016cfee4ce42.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/ificVhd/bovitijegezeg.pdfIn PDF document text
    • http://pearhaidhr.fun/vaduz5cbwj.pdfIn PDF document text
    • http://dozisozaxup.22web.org/manning_guide_sample.pdfIn PDF document text
    • http://helpverifedbadges.com/tivoriwujunoez5wi.pdfIn PDF document text
    • http://xipevufizokev.iblogger.org/kegisovoka.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/gWhjFjg/gikemakubofuzoxa.pdfIn PDF document text
    • http://pazobano.iblogger.org/8745165526.pdfIn PDF document text
    • http://gojuwogerex.iblogger.org/blackpink_playing_with_fire_live_performance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sojugixu.epizy.com/skype_7._59._37.pdfIn PDF document text
    • http://jixuwir.rf.gd/63044110478.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_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 4928 bytes
SHA-256: 51bddc71ad221e6b17d1a8a1e82f5670ef7f799161190c8dbaec98433faf6d0c
font_01_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 10700 bytes
SHA-256: 2b7cbac37b26931f4eacb6a33fbf491b4f72e7d18219d14360aa5057a684f8f7

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