Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ab169aab73f801…

MALICIOUS

PDF

77.4 KB Created: 2021-04-07 09:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff4b207213acd44b68bb82df05e7453e SHA-1: bc3ec658d895da9a0764ce78ee803d63d07f4633 SHA-256: a9ab169aab73f801ccd1912a1b7d8931464f5be673336b15d534ba06a16f843c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to a missing tools folder, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/123?utm_term=platform-+tools+folder+missing
    • https://static.s123-cdn-static.com/uploads/4418184/normal_5ffcc579d9f31.pdf
    • http://zuxemesemubozo.mywebcommunity.org/90709608248.pdf
    • https://static.s123-cdn-static.com/uploads/4380070/normal_5ff576257bdfb.pdf
    • http://palamuduto.iblogger.org/wukavatodoxapijuwisewade.pdf
    • https://cdn.sqhk.co/pobijejok/0zHjgru/ludapatuvesinujutusuwud.pdf
    • https://cdn-cms.f-static.net/uploads/4369307/normal_603e920cf0bb2.pdf
    • https://cdn-cms.f-static.net/uploads/4474206/normal_602a26fdf142e.pdf
    • http://legarojute.iblogger.org/is_a_heat_pump_the_same_as_a_mini_split.pdf
    • https://cdn.sqhk.co/xororofomed/cyTzjcU/spider_card_game_apk.pdf
    • http://desajegurake.scienceontheweb.net/best_autocad_printer.pdf
    • http://dejivuxa.mygamesonline.org/backpacking_checklist_rei.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_feae8ee703a341b781b5a3a281cdf67e.pdf?index=true
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_a0508619531e486d9d98f0b342dcf712.pdf?index=true
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_47d96ec2140c4864a9bcb677d3bfc71a.pdf?index=true
    • http://livugaxoretedop.epizy.com/vetagipizuputojagugesu.pdf
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_105ca2dbfa9b4f2c8385ced89b954f88.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a9db0892-2d97-4ad9-b238-5e8381f263c5/90883990494.pdf
    • https://uploads.strikinglycdn.com/files/8187640b-9244-4e59-ab97-5d511533d0b1/xifufizefijebijesazeke.pdf
    • https://uploads.strikinglycdn.com/files/252a330d-6169-4808-8688-44b2821c8a99/nazilovokezuda.pdf
    • http://jefitanebigovun.rf.gd/principios_del_budismo.pdf
    • http://pitigapevede.onlinewebshop.net/assessment_for_learning_book_in_tamil.pdf
    • http://jujobope.atwebpages.com/rosanulakipup.pdf
    • https://uploads.strikinglycdn.com/files/1eed54fa-7447-4bfa-92ef-b7e40c3a19a8/how_to_convert_decimal_ratio_into_whole_number.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee93.bin
0770d6ce097950746a2e16c6456bc8d4ae5acf2c42acbf24c4cbc09c0f82bb70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 5260 bytes
font_01_sfnt_off00010069.bin
ffbd660ab12ee19df34cbfd3fb7e60f0ef11ec4f0c4590ee27d6039d6304187d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 11764 bytes

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