Malicious PDF — malware analysis report

Static analysis result for SHA-256 7649ec0f793992d8…

MALICIOUS

PDF

88.3 KB Created: 2021-04-04 15:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4a2bde90951e09d1764d431ed343a0e9 SHA-1: b29eea29df125cf9e2549ee0e2ab722134d7530b SHA-256: 7649ec0f793992d89dba5eb0f1cc26e758e5acdf7493375848b017bf0a17d01e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm or SEO manipulation scheme. The presence of numerous external URIs and the overall structure strongly suggest it's designed to redirect users to potentially harmful content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://baarspo.ru/award?keyword=biographical+approach+pdf PDF link annotation
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/254463.pdfIn PDF document text
    • http://fiwazurenorin.iblogger.org/39101813335.pdfIn PDF document text
    • https://cdn.sqhk.co/winibitorut/FGvhcie/33521011501.pdfIn PDF document text
    • https://jefilixepiras.weebly.com/uploads/1/3/2/6/132681342/f21411.pdfIn PDF document text
    • http://nonly.xyz/keystone_f89_datasheetr53kp.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/jRgjgiY/huntington_mobile_banking_app.pdfIn PDF document text
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/3518683.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/black_and_decker_coffee_maker_cleaning_instructions2xxxg.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/jcZttgi/dodge_truck_seat_upholstery_kits.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://salonlabs.xyz/kapewesusavefgg52s.pdfIn PDF document text
    • http://ryukzak.digital/interior_designing_classes_onlinec364f.pdfIn PDF document text
    • https://cdn.sqhk.co/fedukifenufu/hahhnji/video_er_professional_chrome_how_to_use.pdfIn PDF document text
    • https://cdn.sqhk.co/vetipewalu/ciehdY9/rakujokaronojulemedi.pdfIn PDF document text
    • https://jalebipozufi.weebly.com/uploads/1/3/5/3/135320073/e4ddb0432784.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xavitemis.rf.gd/phonics_workbook_kindergarten.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_3d1bb834f67042c195ec6138a5cea7fe.pdf?index=trueIn PDF document text
    • http://matefurixexa.epizy.com/chaka_chaka_song.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_e327eea24fda4aec882dbff29052d7e2.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_64837147ec7449bb920fad5aa5a23a65.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_c0a251c2a2974f10a327904ced9fa555.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 21400 bytes
SHA-256: 123cf6ac13db63fb6378eb882364cde54ba57cdd8329bf9ffc0a6e26f59d47fb
font_01_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 5288 bytes
SHA-256: 177be6567d33027abf6f2aa3712f9f9bb820239d12372731b74f76e58121f584
font_02_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 10816 bytes
SHA-256: 5dad4632a0cd3bc4276bc767eb15fed68367c1dfc5a31a3124815d0bb30e2bde