Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a88ae5b1ed64a3…

MALICIOUS

PDF

78.4 KB Created: 2021-04-03 15:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15b42644ea0c3094eae29b1c911855df SHA-1: 9808987b86e1018d486d4ec518dd140a05931715 SHA-256: 37a88ae5b1ed64a3143d52aa46041c7a6cf9fc487596f228df0bea3089a8a307
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs points to 'kuzutuzo.ru', suggesting a malicious redirection. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=2002+7.3+powerstroke+transmission+cooler
    • http://mxbur.fun/hard_food_words_for_hangmanmvmrc.pdf
    • http://how2clever.com/35587558961lvy2g.pdf
    • https://static.s123-cdn-static.com/uploads/4366400/normal_5febcf804b3f8.pdf
    • https://static.s123-cdn-static.com/uploads/4489598/normal_5fefc5754e019.pdf
    • https://cdn-cms.f-static.net/uploads/4445101/normal_603e5dca62aa1.pdf
    • http://a-trvl.ru/the_comedy_bible_amazondnhoo.pdf
    • https://cdn.sqhk.co/pupumukisev/Vhc1iju/45824151407.pdf
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/faxisumosakutil-mizedajanumekes-duwazikuzawi-figaxiralapof.pdf
    • https://fanamixaxa.weebly.com/uploads/1/3/4/0/134017579/wujowe_vebom_kasoniregekila.pdf
    • https://cdn-cms.f-static.net/uploads/4479435/normal_6032b1ff2b1e5.pdf
    • https://cdn-cms.f-static.net/uploads/4473654/normal_604bc2366c96a.pdf
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5fee3015940be.pdf
    • https://xopuwofotore.weebly.com/uploads/1/3/1/8/131871456/zufubavalav.pdf
    • http://net-klientov.ru/cruz_beckham_school_uniform289rj.pdf
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/9746386.pdf
    • https://cdn.sqhk.co/gevagedubop/f4Bhhz8/sedafoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sajatofubote/35271308836.pdf
    • https://s3.amazonaws.com/risalenefazozo/2015_ford_mustang_gt_premium_0-60.pdf
    • https://s3.amazonaws.com/vexosafugunu/denova.pdf
    • https://s3.amazonaws.com/punurum/cloudy_with_chance_of_meatballs_3.pdf
    • https://s3.amazonaws.com/tevigotu/59060026132.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_off0000f31c.bin
c8fcf31a9d8c888b001565cb22414cb1d9170c3d4e6cc6ba619e04e7c53ed790		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 5688 bytes
font_01_sfnt_off00010688.bin
8ef6b8a25c11973c5d42e59b971cd5246e5bb00d441a2faf603e11d71443d72b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 10900 bytes

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