Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a981c3f09a8963…

MALICIOUS

PDF

79.2 KB Created: 2021-03-12 17:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6c012b763a1cdba23cb6a1476ddc9e1b SHA-1: ec88bc43b3be0e972d86a6b4f4d2cb3adc11525a SHA-256: d4a981c3f09a89633891b4f85cd02dd7561fa8f22da96945b61c91b57404d33f
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 hosting and are associated with link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/123?utm_term=game+asphalt+7+heat+mod+apk PDF link annotation
    • https://zizovelet.weebly.com/uploads/1/3/1/3/131380569/toniluwizap.pdfIn PDF document text
    • http://tehnopolis.org/cash_voucher_format_in_malayalam81rpd.pdfIn PDF document text
    • http://probnik1313.tech/wadepoviwodudosovepifafikiot5o.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/zixilurunubarufovil.pdfIn PDF document text
    • http://lifeit.pro/towuzibosalekolixek75efq.pdfIn PDF document text
    • https://nipukidifa.weebly.com/uploads/1/3/0/8/130873732/fiwez.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/briggs_and_stratton_craftsman_6.5_horsepower_lawn_mower_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_602a530a7ca11.pdfIn PDF document text
    • http://poradoit2.site/convert_action_file_tosup0s.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/15322023921.pdfIn PDF document text
    • http://gatorama.fun/servsafe_manager_7th_editiond377s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368767/normal_5ffa85afbaa58.pdfIn PDF document text
    • https://tumugisoluxadez.weebly.com/uploads/1/3/4/6/134601474/fifur-renok-zugojede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423700/normal_5ff1167039536.pdfIn PDF document text
    • http://tizadejaso.getenjoyment.net/world_history_final_exam_multiple_choice.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/rixevozajixezos/30466707502.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_f35fb01579ff46fa82ad273dafb0fbe7.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_16cbcdb9af794669b41f19d866cb8d0b.pdf?index=trueIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_3c070fc9645947cb88cf8f10d05e6574.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/58574350406.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/kemapaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 4912 bytes
SHA-256: d5f1e9c340e4e89f6fdfb462e56a27867847259f528822175777af315d3c65e9
font_01_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 10688 bytes
SHA-256: 5550e5c0c417534baf3f08233ed3e4b523713f80f33bd4bbb56aca67b9b7fa00
font_02_sfnt_off00012160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12160 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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