Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aef394f60645bb6…

MALICIOUS

PDF

78.6 KB Created: 2021-05-12 08:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bd37c3534ca0be020c6ecf79583533c7 SHA-1: d7d4e9a8966cbbb82249ae1ee1cd93e81c2ab246 SHA-256: 6aef394f60645bb6b7b5754bd10617b75a11619713ad5c8ec37a1ff4acc461cd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or redirecting users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=the+last+song+movie+summary PDF link annotation
    • https://tevukebejesa.weebly.com/uploads/1/3/2/6/132695492/22369f6bf04750.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/iiggiie/takeout_restaurants_near_me_drive_thru.pdfIn PDF document text
    • https://cdn.sqhk.co/raxipopu/Vib4i5n/samorost_3_demo_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/bgd9Hy4/oscar_fish_price.pdfIn PDF document text
    • http://gtomishebs.xyz/43987648762rdq0n.pdfIn PDF document text
    • http://chempion.coffee/splash_brushes_for_photoshop_cs6_frees4z16.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/59eca8c2e73.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/zanewib.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/Uiagfy1/33812178974.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/cfd_in_matlab.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/dxbjcsI/8650910832.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/nidodope.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/tatagazigawoguwediwan.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/ghhhjjd/the_bubble_shooter_story_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/QifhhMf/49130768096.pdfIn PDF document text
    • http://fodekofuxuvum.sportsontheweb.net/magic_tree_house_book_list_merlin_mission.pdfIn PDF document text
    • http://zusagukitu.mywebcommunity.org/australian_english_curriculum.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/is_chevrolet_camaro_2010_a_good_car.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/what_foods_does_not_have_gluten.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/lepabutilov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 5208 bytes
SHA-256: 5d1e5166f550d1f63f144249685bd7021a7165927faaad78c49c8c406c91d48e
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 11320 bytes
SHA-256: 5c483f6583438679b24bbdc0a442527cbca4e766eecc164ae01757a9605676bd

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