Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d0462f237647e2…

MALICIOUS

PDF

74.3 KB Created: 2021-01-25 20:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6a76ea7c09ce18b0bf9f7355a9c4a00d SHA-1: 7d2b9058ea9856d62f9f3269c377daaf29b4e1d9 SHA-256: e4d0462f237647e2dd63251d66c61a2a23a27815e9e928646a5d4d8cf83aa3ca
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an external URI pointing to 'jacksth.ru', which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'Audi a4 owners manual pdf', aiming to trick users into clicking the malicious link. No scripts were extracted, but the presence of external URLs and the ML detection strongly suggest a phishing or malware distribution attempt.

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://jacksth.ru/123?utm_term=audi+a4+owners+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/weteroliwo/jjgjcRf/6124277945.pdfIn PDF document text
    • https://cdn.sqhk.co/bipukawu/kTjftgf/titan_quest_builds_2020.pdfIn PDF document text
    • http://perevod-card2card24.site/calories_in_bubble_tea_with_popping_bubblessu31h.pdfIn PDF document text
    • http://samettemiz.xyz/1289519745kp0fb.pdfIn PDF document text
    • http://vuvuga.xyz/52922162085w3r3.pdfIn PDF document text
    • http://hamsterbig.com/switch_audio_converter_free_apktpnra.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/geGjeub/bowonovujenowo.pdfIn PDF document text
    • http://center-about.com/one_touch_draw_mod_apk7lqiq.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/dhM6Iji/icing_on_the_cake_meaning_opposite.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/eggea29/gafixibola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fidefofudi/vabatidarebulozanuvisa.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/11184883630.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/82277746617.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/zalegugaseluroli.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/millennium_saga.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78E 5160 bytes
SHA-256: 441a469069363641b88baee6194496d3669bd206fc173721a8c1bed31af328ff
font_01_sfnt_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 10736 bytes
SHA-256: 5bfbce44559ec9b3dd8af87461527fcc3939751cf2da09c026694fcd99be9c22
font_02_sfnt_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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