Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a3ae1b45115f8c…

MALICIOUS

PDF

112.5 KB Created: 2021-03-18 05:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6846fc49b216d4821498ac2304c018aa SHA-1: f8d2a095f735ab2555e5db4e85f14c760abae998 SHA-256: a6a3ae1b45115f8ce5f518c2f1ae2379f17653d1f3f0c1c2bcccf744141b6c60
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=v+for+vendetta+novel+pdf PDF link annotation
    • http://topagut.iblogger.org/vmware_player_14_pro.pdfIn PDF document text
    • http://ludshop.xyz/bast_el_nombre_del_vientofg8jz.pdfIn PDF document text
    • http://groshyk.site/9348149466390e9i.pdfIn PDF document text
    • http://reduslim-officialsite.site/how_to_use_one_touch_glucometer_in_tamileddp8.pdfIn PDF document text
    • https://cdn.sqhk.co/jonosefo/74RI7ja/definition_of_ethnic_conflict.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/dhi3lOw/xidudi.pdfIn PDF document text
    • http://xigotazuwal.iblogger.org/combining_like_terms_pyramid_worksheet.pdfIn PDF document text
    • http://miiliioner.xyz/lopuvivutapi1o06p.pdfIn PDF document text
    • http://nikaold.site/490177587905zxgm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_5514d2b14d0b4762a0e6a3671d8750e0.pdf?index=trueIn PDF document text
    • http://kuwitupufori.rf.gd/ditibajagovok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a3724c6-3ceb-4b8e-9bb0-e7d542f3da56/how_to_beat_team_aqua_in_lilycove_city.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_ece26e02a1cf41e6985dc0a71675bf35.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f888213-f297-4b6f-bcea-7470337f5ea3/what_are_the_best_reading_comprehension_strategies.pdfIn PDF document text
    • https://8e6fe9cb-6e01-49b8-a8bf-add1d7538daa.filesusr.com/ugd/4e948c_db5a1901f5554e86868f6ecbbc60ed9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93641516-21e7-41df-8da1-ceee20e997b1/90843965808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffc2f8d1-f56e-493b-b5a7-2a4023026a31/42199178852.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/ruvemomosedifofekovaropi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7f53df-8b9c-4886-b68d-5a0ee2a151b3/62859712013.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_3f31b6b941c146c997bffe89522b9754.pdf?index=trueIn PDF document text
    • http://lunufisisosixi.rf.gd/is_there_burger_king_in_ukraine.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/score_hero_hack_version.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/avalon_vt_737sp_manual.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00017eb9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17EB9 22728 bytes
SHA-256: 246ccdf9248d2dfd6ca110fdd5e1613ed54394273f7c041075082df15d9f2c94
font_00_sfnt_off000146e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E7 4624 bytes
SHA-256: 108adcc1fbd5a4da581522705856a40e6ac90c08187ee41146ae3ae96624bfd2
font_01_sfnt_off000156b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B0 11792 bytes
SHA-256: 6e8169da69ad01cd3adff854bb3012e9d626c38a24fee51ce4731117f84ea025
font_03_sfnt_off0001a63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A63D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3