Malicious PDF — malware analysis report

Static analysis result for SHA-256 18204ec182282943…

MALICIOUS

PDF

74.2 KB Created: 2020-12-23 06:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96d2e86e4fa6563bd71f84b8241bef94 SHA-1: 1c79cffc9bbb05c80f4ff7fc8f132fb6b958f07d SHA-256: 18204ec18228294335527f2299bbe199d6a24667d37c825646fec33e3a8f2de3
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'colour harmony for artists', likely intended to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/strik?utm_term=colour+harmony+for+artists
    • https://wenezobu.weebly.com/uploads/1/3/4/6/134625155/risutuwajeke_numigovapi.pdf
    • https://godikifamubexi.weebly.com/uploads/1/3/4/6/134622632/tawozuv.pdf
    • https://niridugur.weebly.com/uploads/1/3/5/2/135296669/100324.pdf
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/bukefakonuniduk.pdf
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/zalajanijol.pdf
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5fa7116067381.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xeropizuwe/42724339806.pdf
    • https://uploads.strikinglycdn.com/files/02038efc-0d13-4bb2-8998-112d24422c35/best_movie_download_apk_mod.pdf
    • https://uploads.strikinglycdn.com/files/9566531a-4dc7-423c-81d7-90d71b6ae95d/latex_system_of_equations_right_brace.pdf
    • https://uploads.strikinglycdn.com/files/1e24fb9c-57f0-4817-aa4e-c827ce34bb28/xivavulubobusizugisaw.pdf
    • https://s3.amazonaws.com/xidazeze/annamayya_movie_audio_songs_naa_songs.pdf
    • https://s3.amazonaws.com/dadupawo/chemical_reactions_worksheet_key.pdf
    • https://static1.squarespace.com/static/5fbffb1ae9fc3622d51d09b9/t/5fc5367c4f98375720880a79/1606760065963/toy_story_4_full_movie_free_dailymotion.pdf
    • https://static1.squarespace.com/static/5fc3676dc6d96458363207a7/t/5fd10d4dc8ca48183fc24633/1607535950177/97876610767.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e655.bin
7a1ef55d8acbd9526a9d0832dc05a39dfda29c2595f3a2d349ce3b1b881df9b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 5012 bytes
font_01_sfnt_off0000f73b.bin
bc020ca9641ffdbcae3a0c50a602cf61077c106cdae08bcb9298dd2df60df841		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 11036 bytes

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