Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9c1a01461a225d…

MALICIOUS

PDF

71.1 KB Created: 2021-05-06 02:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44ba55e41534b668fa49dc7bc5c77e7a SHA-1: e93cafa6b7f38f53b0a97f3119f4b16ffc2e3798 SHA-256: 8b9c1a01461a225d32d8cd1cd6416140dc282bc150e687f4a0076f1b0416915f
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL, disguised as a 'can opener instruction manual', likely leads to the download of a secondary malicious payload. The presence of PDF-specific heuristics further supports its malicious nature.

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://inwebjor.ru/uplcv?utm_term=can+opener+instruction+manual
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876d8eadd5f---tanasidutovir.pdf
    • http://10glazsikeyrosa.ru/file/41263300331.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609312a4a58da---xavisiwodim.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec41f62a55---xixolerojefiwifo.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9286f0837bfbd70040a0834176ad34b7/62815459570.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbb9a4e613---rimikodejavowubujifix.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad37b0871a---gapoferufiguzo.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/21a901b2ec82437edccb1bb411c47a51/81228650576.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087af3e9606b---48976897961.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/86964872747.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f83a27528---kenobimitiwubud.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acf018de32---zojemisiwifowafo.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a53bff843b88b79345e9c19c756f89a2/39094616887.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/tncnf9d9rmi6lpdiicml5en8t2/84858079970.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607687075c140---49882149313.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/t22qbvo0j7kthhkh2c699snri4/41514403823.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/74ca828170eba6aa5c48a2f5142dd79f/57440068801.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d937.bin
7ed6ed18f53eb375d1ebdf8e378a02f9afb46e7ed410c56d342af6ec4e877eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 4984 bytes
font_01_sfnt_off0000ea10.bin
064a9026f770b2f932489dc74305214e29228709dad84985f9202a6a6db9a04c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 10492 bytes

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