Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc11be5ff3ef9d80…

MALICIOUS

PDF

82.1 KB Created: 2021-04-06 10:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 82b4ff34bdeec01a3bd1d656227e39d8 SHA-1: ddcc35ef70a7891e2eea416e0808353556da53d8 SHA-256: bc11be5ff3ef9d80660f22bc4d02353485006e1df3322edafea240aa15a6614a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/strik?utm_term=the+book+of+life+characters+and+pictures PDF link annotation
    • http://bejavof.22web.org/vm_vsphere_client_5._5.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/geoghgf/kiss_of_war_characters.pdfIn PDF document text
    • https://leneguvajetuse.weebly.com/uploads/1/3/1/3/131380977/1351474.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/VjaomQg/17233365632.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/zhhibdo/49849885799.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/4082464.pdfIn PDF document text
    • http://trokot-shtorki.online/874258614706430j.pdfIn PDF document text
    • http://modusebipiz.iblogger.org/ipad_mini_4_price_philippines.pdfIn PDF document text
    • https://jakinamil.weebly.com/uploads/1/3/4/3/134391996/bebemedoxoziv_gujexun_budunodokavu_vinageralidosab.pdfIn PDF document text
    • http://atlas-copco.su/vetivowosolebepeg1xydi.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/ihXjcje/prop_hunt_portable_ios.pdfIn PDF document text
    • https://mozibidu.weebly.com/uploads/1/3/4/7/134763316/kopadowik.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/jakLjdc/87437758404.pdfIn PDF document text
    • http://wdd13.ru/microbiology_notes39huq.pdfIn PDF document text
    • https://tevuratoza.weebly.com/uploads/1/3/4/0/134019225/3596294.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/fgdhh30/modern_commando_secret_mission_fps_shooting_games.pdfIn PDF document text
    • https://cdn.sqhk.co/sodovokak/cjadgjy/52507576364.pdfIn PDF document text
    • https://cdn.sqhk.co/vipatajase/e2ifiiT/93479167426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujupav.epizy.com/attack_on_titan_2_final_battle_ocean_of_games.pdfIn PDF document text
    • http://fisumude.rf.gd/math_101_college_algebra_book.pdfIn PDF document text
    • http://nawuxek.rf.gd/pogasijenokoti.pdfIn PDF document text
    • http://siparedobapu.rf.gd/teacher_observation_lesson_plan_template.pdfIn PDF document text
    • http://gosonuvubunevo.epizy.com/wofadosomumomokusim.pdfIn PDF document text
    • http://zaxawogaxema.epizy.com/43231892054.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_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 5396 bytes
SHA-256: 20dc121a3edd5df6d3ec8766ba7df52a21bc850e53232d6b20a1260169545570
font_01_sfnt_off000115f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 11128 bytes
SHA-256: 2f916a851317abd7f9ae1f57cc262956e7be36790e08719633540763d57c7ccb