Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf12a2b959aa6b9…

MALICIOUS

PDF

99.9 KB Created: 2021-02-23 18:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3e30c71371c3e2d0ef32e7a88e1ba8dc SHA-1: e2ed3d7c5af0ec46a11ca71822120f79c2fa609e SHA-256: 9cf12a2b959aa6b9b41dc50b22a25afed8186a6480471bf557df4f044944f96c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a suspected phishing or malware distribution site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=el+poder+de+la+mujer+que+ora+pdf+descargar+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503987/normal_5fd2f02ac1116.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/ibmHige/ratit.pdfIn PDF document text
    • http://positarinirib.22web.org/fimeworepiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/hhgdLVJ/is_the_pac_12_app_free.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/cweq0hf/48300953330.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/hfifmic/venmo_account_for_business.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/drBicfB/maz_pillu_mp3_song_download_pagalworld.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/3qgj5ih/raid_shadow_legends_avenger_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/djciLxy/jefevotezadujugova.pdfIn PDF document text
    • http://gutezazotogilup.22web.org/chest_guidelines_oral_anticoagulant_therapy.pdfIn PDF document text
    • http://tonopexoni.22web.org/nda_1_2019_set_b_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/UQlgR3y/best_wood_for_carving_in_new_zealand.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://s3.amazonaws.com/visagogijulep/tisagakosusifijiboxasetus.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/mubodexugavapa.pdfIn PDF document text
    • http://fonugaxow.epizy.com/stylesheet_class_vs_id.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/crystal_report_c_visual_studio_2008.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/78141165018.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/85576779949.pdfIn PDF document text
    • http://lepomosafajuki.rf.gd/kalkulus_gigi_adalah.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 5412 bytes
SHA-256: 69410002aab11b55c264efef0f85eda52e5962e9f8e637b0dda7d1d694b3e572
font_01_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 4284 bytes
SHA-256: ec9aaa6371a733839ea313914a88533084455848883d3b3998a73cb642e77563
font_02_sfnt_off000133eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EB 12552 bytes
SHA-256: 6ae196ff4cd3ce2e94b120760bffdefe1d69b541626e7d302235080a4ae15a94
font_03_sfnt_off00015c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6E 16116 bytes
SHA-256: 3dae81b76154e7c62b3b0d30507344c78f02ee9172d09a03fe7a9af96af9e849
font_04_sfnt_off0001714b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1714B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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