Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e83f78e9f2d24e2…

MALICIOUS

PDF

81.8 KB Created: 2021-03-29 04:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d13bd9ea9261664418038a404703207c SHA-1: d5eeca7aaead60b44b74d64b4e9e582bbfe7a959 SHA-256: 8e83f78e9f2d24e2c660f8b3941c0e0f85317954ee597685578cfbcdf3097613
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://zajinet.ru/strik?utm_term=shadowrun+hong+kong+best+melee+weapon, is directly embedded in the document's metadata. ClamAV also detected this file as Pdf.Phishing.Trojan, indicating a malicious intent. The presence of embedded URLs and the link farm suggest an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=shadowrun+hong+kong+best+melee+weapon
    • https://cdn-cms.f-static.net/uploads/4366034/normal_602af54556629.pdf
    • https://cdn-cms.f-static.net/uploads/4451555/normal_6041b344437f2.pdf
    • https://solupufaposedi.weebly.com/uploads/1/3/1/8/131857421/87369016c8a4b3.pdf
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/8668086.pdf
    • https://cdn-cms.f-static.net/uploads/4409421/normal_60353e7bc9dfa.pdf
    • https://nibobesexetew.weebly.com/uploads/1/3/4/2/134266191/sowiduperuwovev.pdf
    • https://bokesavuxi.weebly.com/uploads/1/3/0/9/130968985/letevi_wetolukigikex.pdf
    • https://jokazetesolibut.weebly.com/uploads/1/3/5/3/135314514/8d72b0e85.pdf
    • https://wojuguzibuliru.weebly.com/uploads/1/3/4/8/134896427/woxedo-kadofaruwakoril-nefubove-kopapi.pdf
    • https://jodejivosarixu.weebly.com/uploads/1/3/4/3/134314211/304104.pdf
    • https://xurobogi.weebly.com/uploads/1/3/1/1/131163732/mapinirex-domimem-xegufav-gubuguredafizu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/likadojivivofu/danoj.pdf
    • https://uploads.strikinglycdn.com/files/93b49f0a-aa48-408a-a812-96fadc13969c/best_air_fryer_recipes_for_beginners.pdf
    • https://s3.amazonaws.com/pisedij/2nd_london_baptist_confession_of_faith_of_1689.pdf
    • https://uploads.strikinglycdn.com/files/8fb24954-8159-4302-bafb-a089955c73b8/thomas_calculus_early_transcendentals.pdf
    • https://s3.amazonaws.com/juzewojavomofew/how_to_bind_fs-gt3b_to_receiver.pdf
    • https://s3.amazonaws.com/kiguteperilodu/torulebusetajuwamewuxuwez.pdf
    • https://s3.amazonaws.com/gateme/mat_miller_analogies_test_study_guide.pdf
    • https://s3.amazonaws.com/migivewuwe/fuzujubo.pdf
    • https://uploads.strikinglycdn.com/files/bb045741-7c43-453e-a865-fbd70df352ed/77818366130.pdf
    • https://s3.amazonaws.com/xidulumexi/stokke_trailz_carrycot_sheets.pdf
    • https://s3.amazonaws.com/kiwopusafize/pcaob_completeness_and_accuracy_of_reports.pdf
    • https://s3.amazonaws.com/sebunuzu/84076693631.pdf
    • https://s3.amazonaws.com/tigewibejageju/muvosatebiwumorezobu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe3.bin
cca6e09ea730ef3e552bfeb775271c9274cec30689ccd1a27c1b60eb2e75f4b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 5772 bytes
font_01_sfnt_off00011367.bin
306f93ecdda41645ae3f8c6c00fd3a6ef11ba7feec4cb474ad6eae7d33954885
pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 11352 bytes