Malicious PDF — malware analysis report

Static analysis result for SHA-256 731a4798a8454aac…

MALICIOUS

PDF

81.8 KB Created: 2021-06-15 12:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c6def2240771f1987c2e5c4b1d47eeed SHA-1: 0a6e8189830f4c383177ca747809b7c1e6916559 SHA-256: 731a4798a8454aaca6339b39d948b7f9440c67e9e94a19b98122778a586af5ea
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable hosting or link farms, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/pbw?utm_term=thehunter+call+of+the+wild+cheats+ps4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471464/normal_602589c0d7663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_6056bd8bde4e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484814/normal_5feb086364e29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_60c0f53013262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392656/normal_5fcaabb2ee04d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470016/normal_60098baf7ce26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417806/normal_5fcee31fcbcd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452834/normal_605dd8be08099.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4410695/normal_60b4f58e98945.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/23368357-1ea8-4638-bd80-d805667eb540/how_do_i_bring_my_brother_printer_back_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92441cb8-2687-4249-9803-8195c7610397/herman_miller_aeron_used_dallas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371b1be0-ddac-455c-a3f6-d2c31635b054/zizupefader.pdfIn PDF document text
    • http://zobafolu.pbworks.com/w/file/fetch/144954825/nepowadigatesojexasufij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6c1acf-c368-4f04-b04b-b283e52ccb6b/96761897076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457b710a-20b1-4636-a4c1-9583da3e6cf0/learn_french_for_beginners_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40868cd-243f-4062-acb4-ac0404681dc5/gakedirajaxekixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3637b04b-afe7-4cc0-894e-29d38968dc1b/fallout_4_bobblehead_locations_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac7d627-fef9-40e7-95dc-8dccdd19370a/x_ray_cloth_scan_camera_apk.pdfIn PDF document text
    • http://donigipoz.pbworks.com/w/file/fetch/144961914/convert_dat_file_to_mp4_online.pdfIn PDF document text
    • http://nafidob.pbworks.com/f/a_writers_reference_9th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70761033-4014-456c-9e60-b2d7da603a58/lubanupeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb1aae5-45ea-4fc1-a4d1-dfc0555506fc/48728666942.pdfIn PDF document text
    • http://rixepal.pbworks.com/w/file/fetch/145009317/charles_law_chem_worksheet_14_2.pdfIn PDF document text
    • http://tazusun.pbworks.com/f/clash_of_clans_base_layout_town_hall_7.pdfIn 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_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 5372 bytes
SHA-256: 3d878dd764b6b443216847fa4e51e0919e1bc1ffeea7f14e6b492727fcdef4ac
font_01_sfnt_off0001141c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141C 11148 bytes
SHA-256: c65905a6b0887cda133cb95a74b27ed9222578266f9b672d33d482d7bf9f4b17