Malicious PDF — malware analysis report

Static analysis result for SHA-256 861763853d012cba…

MALICIOUS

PDF

69.4 KB Created: 2021-01-03 06:32:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ba542a2b15a9a7c0be754f9182ef803 SHA-1: 42ea4850be23d93922967898d8583dfc4dcd7f5d SHA-256: 861763853d012cba51fc3dc09c48f90d12e7783f5693a458ed804f2bbf13d1de
96 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'traffine.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=florida+graduation+requirements+class+of+2020
    • https://cdn-cms.f-static.net/uploads/4496404/normal_5fe8d6d621f69.pdf
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/5060438.pdf
    • https://cdn.sqhk.co/desiruzag/TcvWvBB/basketball_arena_music.pdf
    • https://zumofimuletoxol.weebly.com/uploads/1/3/4/0/134018509/2110121.pdf
    • https://cdn.sqhk.co/fitamorigob/jijhfhg/love_art_sushi_storrs_ct.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/texifaxepag/mta_bx21_bus_schedule.pdf
    • https://uploads.strikinglycdn.com/files/7961d91d-edc1-4400-bde8-fd4b399f16fb/bdo_log_farming.pdf
    • https://uploads.strikinglycdn.com/files/6f1f251b-dee3-4fde-98c7-5c5fe64d16a5/one_minute_manager_book_review.pdf
    • https://uploads.strikinglycdn.com/files/e0b24506-18d0-4e84-8185-b89cd0753c43/what_is_the_importance_of_heterotrophs_and_decomposers_in_an_ecosystem.pdf
    • https://s3.amazonaws.com/tadovu/jukegox.pdf
    • https://s3.amazonaws.com/jarirotexab/cube_root_math_worksheets.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_off0000d341.bin
fe9472e0e9de0c573ed03f1f92a0055f499f0fe7485bdfae914a5bdad36d63cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 5696 bytes
font_01_sfnt_off0000e68f.bin
f7aded4bd20a9bf7531d866c510639df246f369e31e82eec70a52cff54e2d062		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 10012 bytes

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