Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d3c3cb4b844bed…

MALICIOUS

PDF

65.4 KB Created: 2021-02-18 00:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7fdcd21de283a7cf21120a3e28f5eacd SHA-1: 9b8f5a25a5f18ef5e4894ff9ff8ef94df2341929 SHA-256: e4d3c3cb4b844bedc340ac500b1292c713943f3d589bd90aacd8bbe81e016390
126 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. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's structure is designed to host many links on potentially untrustworthy sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=rc+monster+truck+videos+youtube PDF link annotation
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/4439009.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/jij6wgh/webakavi.pdfIn PDF document text
    • https://duwujesipegon.weebly.com/uploads/1/3/4/8/134883919/4184657.pdfIn PDF document text
    • http://discount50it.pro/the_standard_hotel_nyc_careersmmph8.pdfIn PDF document text
    • http://wowit.pro/edmund_spenser_sonnet_75q8u32.pdfIn PDF document text
    • https://vumirexow.weebly.com/uploads/1/3/2/7/132740730/675551.pdfIn PDF document text
    • http://qqkaxes.xyz/mubonoaflfu.pdfIn PDF document text
    • http://osummer.space/906485964859farp.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/dmvighf/meme_soundboard_for_discord.pdfIn PDF document text
    • https://cdn.sqhk.co/tosijoxopum/SDjePvJ/40404803977.pdfIn PDF document text
    • http://changepass.online/why_did_my_sony_tv_stop_workingi0h2m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/puzovifaxusisaxed.pdfIn PDF document text
    • http://gizogebinide.rf.gd/facebook_ad_guidelines_alcohol.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/making_inferences_worksheet.pdfIn PDF document text
    • http://sobegomogi.rf.gd/amelie_sheet_music_yann_tiersen.pdfIn PDF document text
    • http://jawamamabob.rf.gd/fantasy_football_rosters_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/ajodhya_pahar_travel_guide.pdfIn PDF document text
    • http://medevigad.epizy.com/similar_triangles_word_problems_with_answers.pdfIn PDF document text
    • http://vekujekodabudu.epizy.com/adapter_android_getview_not_called.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/81322776821.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_off0000c59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59B 5216 bytes
SHA-256: bb8ac74cfaa378c12b2eec76816e5a6b1196fddc89c418c1815aac30ad54c7ce
font_01_sfnt_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 9756 bytes
SHA-256: f6b91e6b87fd99fd423d79e587bdd3100bf90da1bef9728019b33a8ae0ac8e6e

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