Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf6c28b1a6d5971…

MALICIOUS

PDF

69.4 KB Created: 2021-03-26 13:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcb72e96dbced54c0d3224d6d3f9597d SHA-1: ae7fad805ca1baa9029b6bda7ae29aefec29c475 SHA-256: 5cf6c28b1a6d5971e799df798bd752157872dca252cf24eec53f3e6507697c52
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'botokaw.ru', which is likely intended to host malicious content or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'atomic number and mass number practice pdf'. No scripts were extracted, but the presence of external URIs and the malware detection strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/123?utm_term=atomic+number+and+mass+number+practice+pdf
    • https://cdn-cms.f-static.net/uploads/4477147/normal_600a7cac7c47f.pdf
    • https://cdn-cms.f-static.net/uploads/4374980/normal_6032bcd455bb7.pdf
    • https://static.s123-cdn-static.com/uploads/4486552/normal_5ffaa1215662a.pdf
    • https://cdn-cms.f-static.net/uploads/4411709/normal_601b395d52f36.pdf
    • https://cdn-cms.f-static.net/uploads/4419626/normal_600ceef7d4d69.pdf
    • https://static.s123-cdn-static.com/uploads/4407057/normal_6001c7390f2a4.pdf
    • http://extrameets.fun/xatorujbbq5y.pdf
    • https://cdn-cms.f-static.net/uploads/4463300/normal_6046e88141ae9.pdf
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/7b1fb32f4a07e.pdf
    • https://bamukozigo.weebly.com/uploads/1/3/1/4/131406799/3615854.pdf
    • https://static.s123-cdn-static.com/uploads/4495531/normal_5ffad7b58d8b2.pdf
    • http://winoorama.fun/wenedanosakitunosezgopdj.pdf
    • https://cdn-cms.f-static.net/uploads/4410432/normal_6012b73290e3e.pdf
    • http://lishop.site/turavopugukekisufatkbnli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_3ecf748b47234d5797ec700a59385e97.pdf?index=true
    • https://uploads.strikinglycdn.com/files/83f99299-0cbe-4754-b9f4-fbd513dbca5f/joyce_meyer_books_battlefield_of_the_mind.pdf
    • https://uploads.strikinglycdn.com/files/6a5ce250-0d2d-4ba9-9e9a-7bb79854f2ed/39640964109.pdf
    • https://uploads.strikinglycdn.com/files/52669825-13e7-489e-a0b4-a95f07d8dadf/75834144288.pdf
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_f65e31c6f583442095d4124748e6311f.pdf?index=true
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_f89c43fa8f6c470e89ed69de97475369.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4c96ba4a-3857-4f24-8344-bfdd1a10b19a/what_does_3_hour_metered_parking_commercial_vehicles_only_mean.pdf
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_3ddbcd784b604b3e89b477713abe5441.pdf?index=true
    • 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_off0000d02b.bin
84e8ac8da0237225e48139619c43c66863a487d9f64493cfc0bc3807b6fe4831		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 5396 bytes
font_01_sfnt_off0000e267.bin
210f251d6265454444eedda94ee0aa846eec15a1dc388d7c1019cd1fb3457f19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 10884 bytes

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