Malicious PDF — malware analysis report

Static analysis result for SHA-256 784805d77e3c8086…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 03:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7f5a4660f0f5dd9899aea0226610b708 SHA-1: 8fc02453a4f36e8583cb0938baf27aa3714f69e3 SHA-256: 784805d77e3c8086ab8edd68183ad1e8cc64627bf804f342967e95c27709523f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to harmful 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=why+buildings+fall+down+summary PDF link annotation
    • https://cdn.sqhk.co/nupegefozub/hgQBPdu/lego_hidden_side_app_all_ghosts.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/ehcvjVy/zufulafawowesap.pdfIn PDF document text
    • http://savozotob.iblogger.org/sobewi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452382/normal_5ffc554e8553c.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/I1iaoie/40905340324.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/hcibiiu/the_legacy_of_the_bones_movie_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/jjaggpp/men_s_fall_style.pdfIn PDF document text
    • http://jesubenodewopob.22web.org/guides_to_effective_instruction_literacy.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/jjOV3hW/the_simpsons_tapped_out_descargar_gratis_para_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530868/normal_5fd678d2b5793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380692/normal_6025c2a6e9005.pdfIn PDF document text
    • http://xiwogukonefem.iblogger.org/94614358108.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/wonder_weeks_leap_10_milestones.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/notifivumeferema.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://latilofu.rf.gd/wow_classic_macro_guide_warlock.pdfIn PDF document text
    • http://duzoweserunojoj.epizy.com/2017_camaro_zl1_manual_review.pdfIn PDF document text
    • http://guxozuzemonixe.epizy.com/34335739326.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_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 5668 bytes
SHA-256: 9bbd0d15df909d5b2dcc09160dfce962df71912f3cdc57b56a68d2f9d8880ce8
font_01_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 10100 bytes
SHA-256: 75bc9eb3635596f503c41cec89abd8060c29e352eea477dfe98b0c171b8b2724

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