Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac688adf02decc0…

MALICIOUS

PDF

73.6 KB Created: 2021-03-11 13:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4ba5bdfcabac574118b61236dd084df0 SHA-1: b04c4a62dcef2f60471af23cb7a75fcf0b9b50a2 SHA-256: dac688adf02decc06218955c5b52428c7f56b274529e9381779d44049e791743
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including those on disposable hosting, and a heuristic for a 'download button' lure suggest a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword search term, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/award?keyword=basic+computer+knowledge+pdf+download PDF link annotation
    • https://cdn.sqhk.co/kewixoretuze/gpjinge/67730166907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_5fd1aee91897a.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/jfjjyja/download_game_a_little_war_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/hd5JFyM/the_university_of_hong_kong.pdfIn PDF document text
    • http://wunuxuvi.sportsontheweb.net/poduxawix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486534/normal_5fc92c834cac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_603bdf4b85e09.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/jjasgdp/dazogemifijogi.pdfIn PDF document text
    • http://dexowowijovovu.iblogger.org/simple_regression_analysis_example_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_6013d0e6b4b8d.pdfIn PDF document text
    • http://pumorux.medianewsonline.com/83658467598.pdfIn PDF document text
    • https://cdn.sqhk.co/derebeduno/guljcif/video_player_banner_twitch_size.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/allen_carr_gratuit.pdfIn PDF document text
    • http://duwosolutanuz.mypressonline.com/what_is_an_isekai_manga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_5fd832ee37e2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e15421d5-9437-4e42-aac8-d1cc1e0d7cbf/polaris_360_pool_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2639932e-9bf4-441e-9e0e-49daf917c5a9/32275833260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c05914-03bf-4eaa-8afa-5c4bb702b402/how_to_get_mobile_hotspot_on_at_t_unlimited_plan.pdfIn PDF document text
    • http://ledojefuvase.rf.gd/vodorefisigomo.pdfIn PDF document text
    • http://kelawezup.rf.gd/bansuri_ringtone_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622ab33a-ee85-40cd-aa37-d68990a50c75/pututuxalubelesoxa.pdfIn PDF document text
    • http://bumumewevebav.epizy.com/long_form_of_iso_in_camera.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_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 5680 bytes
SHA-256: c9421a4a2e591b633aea46a9039b2c761b884078d27aa21106dc10d45b57fbec
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 9964 bytes
SHA-256: 4c690bbf5d126cc90b2b7d345b260c64df84d312fef642c2caabc0f5c95ec42b

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