Malicious PDF — malware analysis report

Static analysis result for SHA-256 2690724a5e7e0d0c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-21 12:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8df26e4804995a1dde79609a367ed8f6 SHA-1: b3c142157e5c799158961e095f3b79d96ff3d593 SHA-256: 2690724a5e7e0d0c13be0e340052f0d188aeb9cef4989a07ae04100bb17bb3e5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to potentially harmful websites.

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://ponafet.ru/wix?keyword=zumdahl+chemistry+10th+edition+solutions
    • https://koludoselutak.weebly.com/uploads/1/3/4/8/134893798/nurunesetorixebuxub.pdf
    • http://rujitexoxobag.mypressonline.com/527063644.pdf
    • https://fofavaduk.weebly.com/uploads/1/3/4/4/134436242/binibuzegedesajer.pdf
    • http://pozijuza.scienceontheweb.net/lexus_rx_350_review_2016.pdf
    • http://xubanapirobula.mypressonline.com/mr_coffee_4_cup_coffee_maker_manual.pdf
    • https://vobawele.weebly.com/uploads/1/3/5/3/135334277/7103621.pdf
    • http://petrol-v-pol-price.site/nudiloxt8245.pdf
    • http://straponartist.com/oxygen_therapy_uk_guidelinesefrs1.pdf
    • http://lamakexo.scienceontheweb.net/ctet._nic._in_answer_key_2020.pdf
    • https://fomezesas.weebly.com/uploads/1/3/4/3/134343882/ximefopilerevakuwe.pdf
    • http://zugemenelil.medianewsonline.com/child_self_directed_play.pdf
    • http://pibarulajido.getenjoyment.net/auditing_assurance_services_a_systematic_approach.pdf
    • http://iranianvc.com/dugetixakabutudapikon26ua3.pdf
    • http://godezigupo.mywebcommunity.org/pisiwidonedorevaja.pdf
    • http://sugebowupubixo.mypressonline.com/arteriografia_membros_inferiores.pdf
    • http://tihefers.online/new_life_foursquare_churchjk3dh.pdf
    • http://indital.space/tezaab_full_movie_hd_720p_downloaddo9eg.pdf
    • http://nepoxiduvilej.scienceontheweb.net/gezunafovis.pdf
    • https://bimidupixujeg.weebly.com/uploads/1/3/4/3/134319160/kekozutupijemoxo.pdf
    • http://salizurewaki.mypressonline.com/46574919266.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_9b4ff4f32aa34cb7974d6c60cac5a7e2.pdf?index=true
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_f7639975af3542b78961185e5b1928bd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb1.bin
acc848a0c444626a002e3ba5307ff05d4620f7da364a4bd7157cf0de68ef038d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 5432 bytes
font_01_sfnt_off00010007.bin
9c919ced9d51d71c9ff99139f02aeb63eb5aa5fdbaf9c0ed24a7608cfe5c49f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 11148 bytes

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