Malicious PDF — malware analysis report

Static analysis result for SHA-256 923a29eef24d082e…

MALICIOUS

PDF

90.5 KB Created: 2021-03-23 06:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cfd76847a33da6bb975bdf64ce6a868 SHA-1: a95390871ee3eba287e2c8c1339ec4919816e799 SHA-256: 923a29eef24d082eb5c684ee208813c7a0fa36f96d0ec95288a33b354c7420bc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on dynamic DNS services or free hosting platforms, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, aligning with the file's metadata and the heuristic identifying it as a potentially malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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/wix?keyword=kendall+and+kylie+game+energy+cheat
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/d4f987851f83f.pdf
    • https://cdn.sqhk.co/demexadol/i0tdgjo/gorillaz_feel_good_inc_meaning.pdf
    • https://cdn.sqhk.co/jakatote/yuRgiwn/rugby_league_fixtures_2020_championship.pdf
    • http://xidufefonudug.sportsontheweb.net/how_to_pair_jlab_to_iphone.pdf
    • https://satepiwe.weebly.com/uploads/1/3/5/3/135350267/sewovemetonipuga.pdf
    • http://info-pages.ru/xazigisojipejeredelobewilb80x.pdf
    • http://gisoboxizaza.mygamesonline.org/dogoguba.pdf
    • http://gosoxegekiri.mywebcommunity.org/the_economist_february_23rd_2020.pdf
    • https://xowemaxixedire.weebly.com/uploads/1/3/5/3/135325030/3cc50263f5334b.pdf
    • https://cdn.sqhk.co/xunijejozi/jjhjaLn/video_promoter_views_for_views.pdf
    • http://mikovil.mywebcommunity.org/the_game_awards_voting_results.pdf
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/gewuvawus.pdf
    • https://zusikemibuv.weebly.com/uploads/1/3/1/6/131606719/namadeki.pdf
    • http://it50off.pro/katifawokewunevaritemk7uxh.pdf
    • https://pixirexujana.weebly.com/uploads/1/3/4/5/134527097/jitobatoke.pdf
    • https://rorupuloloxotog.weebly.com/uploads/1/3/1/4/131409755/6328992.pdf
    • http://pupigojoniru.mypressonline.com/acet_entrance_exam_reviewer.pdf
    • http://muzibatixabu.mypressonline.com/jalokopudeke.pdf
    • http://mavaxur.mywebcommunity.org/pifujebofabiteponurunig.pdf
    • https://lavazelowima.weebly.com/uploads/1/3/4/3/134316744/930c5.pdf
    • https://subutadenurafo.weebly.com/uploads/1/3/4/5/134581349/3b9cfbe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ea.bin
f0eb7c39d6e4e224082bf3d430c10f9c63a857d39a1a64148d921cb01e8784bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116EA 4988 bytes
font_01_sfnt_off000127af.bin
32d78a19dde2d63270c73fd89c40539ddbd966e64fb42e1da3982f82311145f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 11392 bytes
font_02_sfnt_off00014e4d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4D 4324 bytes

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