Malicious PDF — malware analysis report

Static analysis result for SHA-256 c058e9c8fcea056a…

MALICIOUS

PDF

81.1 KB Created: 2021-03-15 10:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 15dfdd5fdf9541aff761bde69e70bfbe SHA-1: 32fd5dfc9d6743ad222588a36e6d3355c7193ad6 SHA-256: c058e9c8fcea056aef7a53c73436a793ec0dd82827d64046573451667f7d73db
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, specifically as a phishing trojan. It contains numerous embedded URLs, one of which is `https://kuzutuzo.ru/wb?keyword=proving%20trigonometric%20identities%20worksheet%20with%20answers%20pdf`, suggesting a lure to download further malicious content. The presence of PDF-specific heuristics indicates it's a crafted PDF document designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wb?keyword=proving%20trigonometric%20identities%20worksheet%20with%20answers%20pdf PDF link annotation
    • https://cdn.sqhk.co/fufitefan/ifhbyia/exonerated_5_netflix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474989/normal_5fe14044ed278.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/bghibhh/69859256998.pdfIn PDF document text
    • https://cdn.sqhk.co/kojuzipag/mhbryjf/limid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5fe109a6f00c3.pdfIn PDF document text
    • https://cdn.sqhk.co/nefowumik/ijxNMjg/team_racing_emulator_and_tips_and_tricks.pdfIn PDF document text
    • https://cdn.sqhk.co/vunofufi/if8thhH/juegos_de_thumb_fighter_christmas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_603cfe1718951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_601490714e1f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421215/normal_5fd152b195b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd1492a6d79d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_604b178a2c0e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5feb0a0f7e1e9.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/KTwyhgi/lewawog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456686/normal_5ff8861470e42.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/2hqsrgg/yokogawa_mass_flow_meter_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/ribovonubod/ghieeQ2/xefefalafapurokopejulil.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/gc9jihe/jodumopotel.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/pHhcqgj/situbumuture.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_604161df32119.pdfIn PDF document text
    • https://cdn.sqhk.co/biloriput/Sg0VbLl/10817640829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 5752 bytes
SHA-256: 9e0d96a536e4828179acd40ac006057848b3c550941939068d3266db77eac178
font_01_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 11732 bytes
SHA-256: 961fc32e25620732dbbeef344efbeb4b172a9000de9ce11bd48cb51d854d8baa
font_02_sfnt_off00011f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 16096 bytes
SHA-256: 58a1e1f5b06e63281e1c84f804f7eeb3fa21835e9eae58838fedc7273f8b9f4b

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