Malicious PDF — malware analysis report

Static analysis result for SHA-256 252f8c97607eb140…

MALICIOUS

PDF

76.0 KB Created: 2021-03-24 12:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b37101f0703f0dcfd09530bc3301d09 SHA-1: 2b5bd4f5f336814a359bca5a5ecb6663976a094b SHA-256: 252f8c97607eb14020dd8fc085ad7e9cf366bf031167a20fc6c8aba64353a419
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'link farm', suggesting a phishing or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=nejm+author+guidelines+pdf
    • https://filavemegu.weebly.com/uploads/1/3/4/8/134883773/kujodeni.pdf
    • https://cdn.sqhk.co/gabazumad/QFVThbL/leopard_robot_game_mega_robot_bike_games_unblocked.pdf
    • https://cdn.sqhk.co/nexuliwadi/SYhdrDB/lobajaxatodobovonepote.pdf
    • https://jutonigozazizeg.weebly.com/uploads/1/3/4/7/134700746/nitedixubumovudup.pdf
    • http://kezijego.22web.org/command_economy_and_market_economy.pdf
    • https://nagipunewemog.weebly.com/uploads/1/3/5/3/135315215/3ce0aca.pdf
    • https://cdn.sqhk.co/tiwoxebu/c03YmcL/dynasty_warriors_4_wei_characters.pdf
    • https://fevebelok.weebly.com/uploads/1/3/4/0/134012800/lanukerodik.pdf
    • https://bamigabimav.weebly.com/uploads/1/3/1/6/131636977/wivofibitukivep.pdf
    • https://cdn.sqhk.co/sakupiraf/idH5ib3/modern_warfare_servers_down_beta.pdf
    • https://cdn.sqhk.co/ninuxoti/jS4hggg/maps_of_clash_of_clans_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bawulega.rf.gd/giroxazijat.pdf
    • http://guwavamo.rf.gd/hobart_1612_slicer_spec_sheet.pdf
    • https://s3.amazonaws.com/pusolefosex/radesiwatetizekuxe.pdf
    • https://s3.amazonaws.com/tobito/sacramento_font_family.pdf
    • http://nobudusoselazo.epizy.com/blessing_of_the_raven_queen_5e.pdf
    • http://pewubep.rf.gd/ada_guidelines_a1c_diagnosis.pdf
    • http://sajipesexadagon.epizy.com/24641416660.pdf
    • https://s3.amazonaws.com/xomudufe/35745005936.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_off0000eb1b.bin
e6fd09615f275887907567bf8284f68b1f85d91eb7f63769d4cb6f60ec056279
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 5500 bytes
font_01_sfnt_off0000fdb4.bin
61e33abb3828d57aa5712820f1ef02dbd77c171a91bf5816f8d23f90ceef87d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 10456 bytes