Malicious PDF — malware analysis report

Static analysis result for SHA-256 264d313368787a81…

MALICIOUS

PDF

80.7 KB Created: 2021-03-14 22:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85d411a57f3ba543473028b10d1ef4ef SHA-1: 1f32b280c9e35559b37efb3e7852b8ba6e4e048c SHA-256: 264d313368787a81dce1783a0c2e55554ed636bf56a76256364ece230bf479ca
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm distribution. It contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' with 30 external PDF links. The embedded URLs suggest an attempt to direct users to potentially malicious or deceptive content, aligning with phishing or spamming tactics. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=does+kimchi+boost+immune+system
    • http://gekifek.scienceontheweb.net/basic_ielts_speaking_free_download.pdf
    • http://gedatidigog.sportsontheweb.net/vafetavokuvujetan.pdf
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/2731734.pdf
    • http://zumewidife.mygamesonline.org/que_es_primeros_auxilios_segun_la_oms.pdf
    • http://dasezin.getenjoyment.net/where_is_the_stand_being_filmed.pdf
    • http://fesadivu.iblogger.org/how_to_fill_a_balboa_hot_tub.pdf
    • http://imm-shoes2.club/686017114750qfe6.pdf
    • http://wimilarudiza.iblogger.org/58730801419.pdf
    • http://smirnoff-optic.com/741979458416xut9.pdf
    • http://gipogup.sportsontheweb.net/pujiruzizozit.pdf
    • http://artdebug.site/nenidafe0e653.pdf
    • http://raisinshub.club/osi_reference_model_and_tcp_ip_model_interview_questions_and_answersngb47.pdf
    • https://tovorugezix.weebly.com/uploads/1/3/4/5/134599805/gafato.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_72c9d41c823e4f16961796d32bffccba.pdf?index=true
    • http://wipadafefuxasi.onlinewebshop.net/fiwimuzojoletopupux.pdf
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_5c54e53fc8c7460c9430e46c4f8b746c.pdf?index=true
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_4ac57db99f0a49989f6ef992c081e721.pdf?index=true
    • http://wajalapivibobi.epizy.com/kejikoliwibepora.pdf
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_d5606fd6e5fa4f909050355cf98577a4.pdf?index=true
    • http://luxupuxud.myartsonline.com/nietzsche_gay_science_summary.pdf
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_b0ef8111a3024e0ba3a17c575859e833.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef53.bin
816d5df742bdda4d12dd115121c5bf4c9755174308d17b1f99c1f94dc7f3c1a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 4888 bytes
font_01_sfnt_off0000ffe3.bin
4641f3e80e3596ff68bed7216b3d46f470a316b88688e95138989ba9895022e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 11224 bytes
font_02_sfnt_off000125e1.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E1 4324 bytes

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