Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc68cf00e26df4d…

MALICIOUS

PDF

77.6 KB Created: 2021-03-02 13:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 55c1c49b7b8c540bcda14142c3020268 SHA-1: 954c92456ecdd90b27aa8cc75b7f1ae5fac5a09b SHA-256: 0dc68cf00e26df4df140df5880441b70026a6cb600ec90a764f77f93ecc03e7f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

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://jacksth.ru/strik?utm_term=1989+suzuki+quadrunner+250+plastics PDF link annotation
    • https://cdn.sqhk.co/fikubife/aAS8nfV/jibulafinawenejuf.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/oxford_english_dictionary_free_download_full_version_for_windows_8.pdfIn PDF document text
    • https://cdn.sqhk.co/felibepudu/Oa7hiha/perabupomafasexaxamoboza.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/bjijieU/53062941892.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/wudasaw.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/kezoba.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/MhcnhcZ/swamp_thing_dc_universe_dvd.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/hgthaIr/nonstop_game_cyber_raid_discord.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/kjcijig/snake_skin_retro_11.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/PttdCjj/tojedotozofarab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465403/normal_5fd3950848f67.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/cHjjhdn/asiandate_find_asian_singles_apk.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
    • http://zonatenitisa.rf.gd/77597402602.pdfIn PDF document text
    • http://pupisovid.epizy.com/can_you_use_apple_books_on_android.pdfIn PDF document text
    • http://nivuzujanux.myartsonline.com/53161722731.pdfIn PDF document text
    • http://duwufinojitu.rf.gd/bvt_lab_answers.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/dungeons_and_dragons_5th_edition_character_creator.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD596 3312 bytes
SHA-256: 082c89522e4251f0a814862fddf633b1dac669eb780a02580130c1f52bfffe84
font_01_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 5784 bytes
SHA-256: 41f842921fff6d6fd6e081623e634a8c63ac4999fd79bb9c587aa3f52af7c3a7
font_02_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 11256 bytes
SHA-256: 00455efbb582af80e1f349b7e33940f1f29d7bbc892422a7d4983a1256fa3735
font_03_sfnt_off00011b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B18 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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