Malicious PDF — malware analysis report

Static analysis result for SHA-256 60c393390686afc2…

MALICIOUS

PDF

78.9 KB Created: 2021-05-20 09:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 120203f4eb9fd9cb06c5c19d6b44f8a0 SHA-1: 4d445a6352f54d7629bb2fa132967270f41adec9 SHA-256: 60c393390686afc2ec8f54b81f13fe1ee47bd1ac2deafe600d86a2ece91f40dd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple unknown URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a dropper for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/strik?utm_term=neet+biology+chapter+wise+questions+free+download+pdf
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/a8cdad0ceb.pdf
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/zojojaxesex.pdf
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/6616663.pdf
    • https://woxogobigevi.weebly.com/uploads/1/3/0/8/130814596/44e17b6a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wemupajese/32568645137.pdf
    • https://s3.amazonaws.com/jozaponi/39783225752.pdf
    • https://s3.amazonaws.com/sukedil/90810199401.pdf
    • https://s3.amazonaws.com/mufukep/bumanenaxikiter.pdf
    • https://s3.amazonaws.com/xujitezu/bomirojiboba.pdf
    • https://s3.amazonaws.com/girilifawuxi/how_cognitive_behavioural_therapy_works.pdf
    • https://s3.amazonaws.com/xeropizuwe/31480069109.pdf
    • https://s3.amazonaws.com/xebuvuwov/family_tree_sample.pdf
    • https://s3.amazonaws.com/nalifij/espn_fantasy_football_cheat_sheet.pdf
    • https://s3.amazonaws.com/vexeliku/73318628001.pdf
    • https://s3.amazonaws.com/pekatikisuruki/double_dapple_dachshund_health_problems.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/bourree_bach_piano_sheet_music.pdf
    • https://s3.amazonaws.com/gumegulaxi/63360300587.pdf
    • https://s3.amazonaws.com/wupiwupiwot/honda_hr215_hydrostatic_transmission_problems.pdf
    • https://s3.amazonaws.com/tiluwisulepam/sigipunevu.pdf
    • https://s3.amazonaws.com/sorogamat/41528517020.pdf
    • https://s3.amazonaws.com/paxuvagal/hp_utility_mac_printing_software.pdf
    • https://s3.amazonaws.com/solonebosop/external_style_sheet_program_in_html.pdf
    • https://s3.amazonaws.com/pojikovewijeja/vexevuvuweripopunev.pdf
    • https://s3.amazonaws.com/gozilum/travel_itinerary_template_word_2010.pdf
    • https://s3.amazonaws.com/tidigudetefumof/55662003553.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_off0000f398.bin
7f09aa952d6700dcd91affe10dca609f7eaa9a6201c6a567a0b43b1c41bb4130		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF398 5848 bytes
font_01_sfnt_off00010790.bin
617bf5a18c707101dabacb3613d9988cadf25e7ea3be14da409e481100c45d82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 11204 bytes

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