Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b66a43f13eb8c95…

MALICIOUS

PDF

71.8 KB Created: 2021-01-05 03:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cddb04f429234bb6ee63ad6f0f326817 SHA-1: 5ed50efbeaad5e7120d8f141074382eeb89a48a3 SHA-256: 0b66a43f13eb8c957367848285e52de539708160e926de8d592eaf528abd50c7
154 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The embedded URL is disguised as an 'Arduino 328p datasheet' to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=arduino+328p+datasheet
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd3aa7313352.pdf
    • https://cdn-cms.f-static.net/uploads/4420448/normal_5fbaade8c9bb3.pdf
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f8c9a434e14b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1736c8e0-751c-4eab-a9f4-a3102c942c49/fifa_20_soundtrack.pdf
    • https://s3.amazonaws.com/remufuzu/dibutawibetukawaroba.pdf
    • https://s3.amazonaws.com/kujesulad/82043580156.pdf
    • https://s3.amazonaws.com/tezude/1753711556.pdf
    • https://s3.amazonaws.com/pasawe/cartomancy_card_meanings_combinations.pdf
    • https://uploads.strikinglycdn.com/files/dd28e25f-3297-4f31-aaab-6acf26731fa8/electronics_merit_badge_answers.pdf
    • https://s3.amazonaws.com/wemazun/70196914947.pdf
    • https://uploads.strikinglycdn.com/files/ea356ceb-dada-48ed-b05c-4bdc10dc8596/florida_expressway_pay_toll.pdf
    • https://s3.amazonaws.com/kakef/toxic_britney_spears_sheet_music_clarinet.pdf
    • https://s3.amazonaws.com/takebemanijewok/luzabaleloxor.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_off0000daf4.bin
be4574a9d169336fefee64d7e1c584c6689fa2cd1f8ffe2c8f737dc84e10e87b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 5492 bytes
font_01_sfnt_off0000ed9c.bin
ffbe4f2a6606ff603509296e8866ef66141eaf240f18c3b23ea17f42d1379e81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 10916 bytes

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