Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dd04fa1e0f5f076…

MALICIOUS

PDF

76.2 KB Created: 2021-02-27 07:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fb1be80d0a66c1e6dc62207811f07ffd SHA-1: 1438d0f9c9971c61fa19102cce8a05f92fd26a6e SHA-256: 0dd04fa1e0f5f07616f50285936bad6814f974ef09e2ae2465bf1e9fdc36d97e
126 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with one specifically pointing to 'zajinet.ru/strik?utm_term=dir-655+firmware+hack', suggesting a lure for users interested in firmware hacks. The PDF structure and the presence of embedded URIs strongly suggest it's used as a delivery mechanism, likely via spearphishing, to redirect users to potentially malicious sites.

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://zajinet.ru/strik?utm_term=dir-655+firmware+hack PDF link annotation
    • http://pubgmobiie.com/83480022457cvxjz.pdfIn PDF document text
    • https://vagoledos.weebly.com/uploads/1/3/5/3/135320004/4676772.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/2005_harley_davidson_sportster_1200_custom_service_manualfkmmi.pdfIn PDF document text
    • https://zapineri.weebly.com/uploads/1/3/4/7/134707132/1387864.pdfIn PDF document text
    • https://wededizopi.weebly.com/uploads/1/3/3/9/133986349/7f887f5.pdfIn PDF document text
    • http://kmplitka.shop/29084181523vuqcm.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/1510283.pdfIn PDF document text
    • http://j3vnci4.xyz/57929475606niwxn.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/xorume.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/43297680566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ludilisi.epizy.com/lumivajixasekazawuniz.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/master_of_orion_best_custom_race.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/vowumonavamob.pdfIn PDF document text
    • http://tosawos.epizy.com/apigee_certification_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/golden_barrel_cactus_care_sheet.pdfIn PDF document text
    • http://mafonoxerinomif.epizy.com/tavatuw.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/cliffs_of_dover_piano_sheet_music.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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 5376 bytes
SHA-256: d51aa626dcd4fb6a4b451136b020bd92f0fb3fe36602d86be4fb829f0dd501df
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 11100 bytes
SHA-256: c2605c38c3650dc72bd2df11b7fdf3991b80d2ee0a48af400c39967a7fbde396

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