Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9933b5aa2b212a1…

MALICIOUS

PDF

71.3 KB Created: 2021-06-11 10:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0d7645ed717f99106a37c6e9e5d70d0e SHA-1: 0572f315e54c07c050f1693d7188ba84c2a732bf SHA-256: b9933b5aa2b212a130702bbf4cac28852c6a08f7f8540f5a1631dc1a67a83117
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 pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing or trojan PDF. While no scripts were directly extracted, the presence of numerous external URLs suggests a potential for downloading further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://garglob.ru/pbw?utm_term=the+physiology+and+biochemistry+of+prokaryotes PDF link annotation
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/bopajukosaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fd22737600b4.pdfIn PDF document text
    • https://sonojija.weebly.com/uploads/1/3/4/7/134723635/lixibazojokotati.pdfIn PDF document text
    • https://kutadaboveg.weebly.com/uploads/1/3/0/7/130738989/baresojobukenuvemibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_606cae509b4fc.pdfIn PDF document text
    • https://sowupetu.weebly.com/uploads/1/3/0/7/130739285/nituruj-ruzarujiret.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_600e45f391b05.pdfIn PDF document text
    • https://nolugebufumo.weebly.com/uploads/1/3/4/5/134597996/lajebenobi.pdfIn PDF document text
    • https://luwuruguvuwotom.weebly.com/uploads/1/3/0/9/130969706/jozaguvelikerepami.pdfIn PDF document text
    • https://bematurom.weebly.com/uploads/1/3/4/8/134886193/kaxurewet-wulawuxul-zakezad-dedumarilukujip.pdfIn PDF document text
    • https://teguzefememefa.weebly.com/uploads/1/3/4/6/134609716/zirilajozev-jabaxiwux-xojaguwubidarug-lesis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ririgifavem.pbworks.com/f/61691806171.pdfIn PDF document text
    • http://kekirow.pbworks.com/w/file/fetch/144808623/3d_surround_sound_video_player_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1c9b6e-296f-4477-a2c8-7c2896e91571/42620612719.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/w/file/fetch/144427683/goblin_cap_1_espaol_latino_descargar.pdfIn PDF document text
    • http://zolunegoli.pbworks.com/f/black_and_tan_dachshund_for_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3987e577-b3bb-4fda-bb6d-31e5e96a69c5/american_society_of_mechanical_engineers_asme_standards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a780324-2c87-4e9a-991f-631cc1282f5d/how_much_time_can_you_get_for_a_felony_3.pdfIn PDF document text
    • http://finebov.pbworks.com/w/file/fetch/144440739/58842856054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a8fa34-c0c2-43ff-b749-1c67a15b780e/moxojagejagof.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_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 5824 bytes
SHA-256: 0bc719fb6cf7adadc81688399a88122b5c79d81d200e04d77212cbe5c79b3165
font_01_sfnt_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 11728 bytes
SHA-256: 2e4aedf61d65957aa79aff7216ac3256b346aee39b9431f98b309a8df559601d