Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f3f2d41fbd4548…

MALICIOUS

PDF

68.7 KB Created: 2021-03-11 18:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: a585f8345b9cf126ea5f3e71b522126d SHA-1: 3dd0463234dba4d0affc92fb40d52f6f5b04d780 SHA-256: 82f3f2d41fbd4548f1dd143b7f6b5e84dc427dd396fa89dc0fcea4beeffaf4ef
96 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://kuzutuzo.ru/award?keyword=msh+brain+2+manual+pdf', suggesting a phishing or malware distribution lure. The document body is heavily obfuscated, but the presence of the URI and the malware detection strongly indicate an attempt to trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/award?keyword=msh+brain+2+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480145/normal_60198fee6e5c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_6041ad00221f7.pdfIn PDF document text
    • http://graatorama.space/thriller_horror_movies_in_tamilykbsr.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/jgiehT7/six_guns_gang_showdown_apk_obb.pdfIn PDF document text
    • http://streichpack.online/bose_companion_3_series_2_weightk7fh0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_60433802d26c7.pdfIn PDF document text
    • http://familyit.pro/94199727522lpi52.pdfIn PDF document text
    • http://cardioactiveuficiale.site/korifi3zhix.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/3oT9MNF/caller_id_call_blocker_pro.pdfIn PDF document text
    • https://zogazipo.weebly.com/uploads/1/3/2/3/132303407/6620740.pdfIn PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/6355673.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443574/normal_6007360d51b69.pdfIn PDF document text
    • http://tgesheff.xyz/4888525026474rza.pdfIn PDF document text
    • http://canonsburglake.com/kidumelelasidigabididiz1qlug.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/fisulefajow/december_1_2018_sat_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/b_k_l_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/robert_coleman_master_plan_of_evangelism.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/26517267083.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/ziriveziponexaku.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_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 5556 bytes
SHA-256: ef0d4b1d29b26f63af7152d8b0992ae2a4b12182c86ae8e2c7b0e0e674cec784
font_01_sfnt_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 10016 bytes
SHA-256: 79e47cdf36605b712e285a87cabfd714b77be1c4085a0e455214d25b58ca6618

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