Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8263912d983842…

MALICIOUS

PDF

80.9 KB Created: 2021-04-02 10:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8cb538c6c27e1d265c4dccd4265ed0c3 SHA-1: 900fffb394a221d44d6c982df56ecf4b23010f80 SHA-256: 9f8263912d983842002dd208c3e3737b81477bfc95fe74fd011c491e712c0b72
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'Dagannoth supreme solo guide', which is likely a lure to disguise the malicious nature of the links.

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://zajinet.ru/wix?keyword=dagannoth+supreme+solo+guide PDF link annotation
    • http://get3creditscores.info/juvikudinomugev4bmdi.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/668539.pdfIn PDF document text
    • http://cafechorsu.ru/stochastic_calculus_for_finance_shreveizbpi.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/xijopumaxot.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/7255644.pdfIn PDF document text
    • http://muzoc.xyz/panasonic_dmr-ez48v_specs5tpr9.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/is_optavia_safe_for_diabetics.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/167520088962q31p.pdfIn PDF document text
    • http://bit7.top/what_is_the_difference_between_agile_coach_and_scrum_master3c9qg.pdfIn PDF document text
    • http://tehnopolis.org/direponewalavamedimeff4nj.pdfIn PDF document text
    • http://prosucre.pro/62927109737gvbzr.pdfIn PDF document text
    • http://lonotel.mygamesonline.org/sepsis_adalah.pdfIn PDF document text
    • http://itsnat.space/mofusigozimaluvom93gp6.pdfIn PDF document text
    • http://shopsmmv.site/practical_file_index_pagec4x5t.pdfIn PDF document text
    • https://tetaretutu.weebly.com/uploads/1/3/4/8/134872422/gamotarigakurejifite.pdfIn PDF document text
    • https://ririsibonegibo.weebly.com/uploads/1/3/4/5/134596323/371f01db.pdfIn PDF document text
    • http://keksik24.ru/dawes_haymaker_1500_review3mkqn.pdfIn PDF document text
    • http://vopezikililurab.mygamesonline.org/macbeth_notes_download.pdfIn PDF document text
    • http://ketadiets.site/what_size_backpack_carry_onuk9qq.pdfIn PDF document text
    • http://kefets.xyz/need_for_speed_no_limits_hack_apk_data4tvr3.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/nejaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufulavidibime.myartsonline.com/ginitedelimover.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_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 5372 bytes
SHA-256: c64afca7387bf3ea81a71afdc22253fde50b168795aa50f8e538dd98fa4db4ea
font_01_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 10736 bytes
SHA-256: 6dfcaefe0bce34bb5d2bef031a589a86dec5a166ba5f4b6a8fefc3e71b9a4ee5

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