Malicious PDF — malware analysis report

Static analysis result for SHA-256 95337b2447839f6f…

MALICIOUS

PDF

70.2 KB Created: 2021-02-23 05:10:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 77dcea6891d2d916233777f42886a6cb SHA-1: 28e6d030c270d1558c83229551065839beff4fe6 SHA-256: 95337b2447839f6f9b461eb7bfc19a2aacce904ab518197e87e635d8e6998063
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a phishing or link-farming scheme. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly indicate a malicious intent to redirect users to potentially harmful content.

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://druttle.ru/strik?utm_term=what+is+curriculum+development+in+the+philippines PDF link annotation
    • https://cdn.sqhk.co/lowimipofevu/hfC0z17/clavinova_piano_repair_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/OfidrTh/hockey_scores_today_montreal_canadiens.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476429/normal_5fe1873f2aa44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421049/normal_5fe068967f3e2.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/convert_webpage_to_on_ipadlrppn.pdfIn PDF document text
    • http://3bki.ru/arcore_apk_modmqwq4.pdfIn PDF document text
    • http://astrohelp.space/56274951626yvwz9.pdfIn PDF document text
    • http://milanomodaitaly.site/94798298904xqr1z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412758/normal_5ffa0843d8e01.pdfIn PDF document text
    • http://rmk4sale.xyz/is_it_legal_for_teachers_to_post_pictures_of_students_on_facebookrs1uf.pdfIn PDF document text
    • http://supernefritroller.xyz/rojoxupesokezomeronami4y0id.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465935/normal_5fcf0c86c5561.pdfIn PDF document text
    • http://stebsmeh.space/my_chicken_virtual_pet_game_apk9i9i4.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/icHibZH/osim_uinfinity_error_19.pdfIn PDF document text
    • http://love-your-lips.online/19429696738cxink.pdfIn PDF document text
    • https://cdn.sqhk.co/nigalasiline/ghbTyje/14700812261.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368956/normal_5fdfb0020b549.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474170/normal_5ff39d7e4b975.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 5388 bytes
SHA-256: 509f469402dd2b46cf1b67a62dfb64abf5838c0a149e872534a1dea10002f1ff
font_01_sfnt_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 10504 bytes
SHA-256: 873f8131d3bd188fbd771f9ad845ab14e00b54a1eb49a8690307802731373f40

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