Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3371fbde5d5be24…

MALICIOUS

PDF

109.4 KB Created: 2021-03-17 21:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 906524667d06053482494214787b0b5f SHA-1: 1c4e6863d0e9472adce47f24b6f7bcdb67821206 SHA-256: b3371fbde5d5be24725e2a25441718d985d5e33e586f3c9cd1f15b6bbe964090
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URI pointing to 'golowaki.ru', which is likely a malicious domain used to host phishing content or download further payloads. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://golowaki.ru/123?utm_term=whitney+houston+soul+train+awards+performance+1989
    • http://chempion.coffee/important_genetic_disorders_worksheet_answer_keyvopcj.pdf
    • http://raisinsapp.club/dyson_animal_vacuum_replacement_partsssknh.pdf
    • http://kukushpa.fun/what_is_zone_proximal_developmentss7th.pdf
    • http://teksalle.xyz/changing_dryer_belt_maytag_performatg819.pdf
    • http://sputnews.com/how_to_use_a_stovetop_pressure_cooker9333g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fomudebipefasu/reverso_dictionary_english_arabic.pdf
    • https://s3.amazonaws.com/lopadivupudexa/writing_engineering_lab_reports.pdf
    • https://s3.amazonaws.com/voxipanovigepiv/bazofunujurofipupujowinu.pdf
    • https://s3.amazonaws.com/xoferuzu/68065900331.pdf
    • http://vovakupalujum.onlinewebshop.net/manorumuxifevi.pdf
    • https://s3.amazonaws.com/bibejovixapis/fixikixavinusipixefib.pdf
    • https://s3.amazonaws.com/dowesitobuga/32383363691.pdf
    • https://s3.amazonaws.com/lijopavexanuse/chaliya_chaliya_song_free.pdf
    • http://rabatelekovufar.myartsonline.com/past_modal_verbs_exercises_with_answers.pdf
    • https://s3.amazonaws.com/jixeremipet/78371288956.pdf
    • https://s3.amazonaws.com/kukazowox/1522409203.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_off00016aeb.bin
fc0483907ba0e66831466460782e611b0d4835463f61d1cb72bc3041abf3fb25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEB 6004 bytes
font_01_sfnt_off00017f58.bin
e682d81ff68af0507aec905fb53860bcc013e2f98ee5ba08a1e76d06dec11afd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F58 11540 bytes

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