Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81891cfceb41bc6…

MALICIOUS

PDF

83.8 KB Created: 2021-03-16 10:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66011512b5f8cae5d075ed006e684d70 SHA-1: d9ff3d86edae13362db44a2890dce2dd98ef0929 SHA-256: d81891cfceb41bc639f6d02b16b2ffc1b8160f1c719d0e81fc3ca285deebd2ce
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URL pointing to 'bologen.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, contains references to 'javascript print pdf blob' and 'wkhtmltopdf', suggesting a potential exploit or lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/award?keyword=javascript+print+pdf+blob
    • https://cdn-cms.f-static.net/uploads/4369310/normal_6011ceec8a674.pdf
    • https://cdn.sqhk.co/kapimetavis/iatcuii/smith_s_market_las_vegas_nevada.pdf
    • https://cdn-cms.f-static.net/uploads/4449788/normal_5fe718ab1711d.pdf
    • https://cdn-cms.f-static.net/uploads/4488581/normal_60475932872fc.pdf
    • https://cdn.sqhk.co/xedasuzefer/7jijagg/winter_war_finland_sniper.pdf
    • https://cdn.sqhk.co/semegopo/jfghIhj/pinakivemidowibuwasux.pdf
    • https://cdn.sqhk.co/sixerusesebu/ihLUajf/81791648511.pdf
    • https://cdn.sqhk.co/rozesivotix/ewBjcsR/bomamalefa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/036ac4f0-2166-45b8-ac45-77a3f693156e/tigupura.pdf
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_f972cf2cbe344044a15d708ef98ef027.pdf?index=true
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_c785182a19e74993a4a88ab342157d64.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aab2c7bd-314b-4330-8dc0-bb698a32fdd1/28772054837.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/lung_arteriovenous_malformation_radiology.pdf
    • https://uploads.strikinglycdn.com/files/10f469c9-33ca-41f5-bff8-8ef7a56cc953/zovepumexatafurewus.pdf
    • https://s3.amazonaws.com/savifin/dedudetigunokabak.pdf
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_b91c84ce3c5e4507bc3c2040066d696b.pdf?index=true
    • https://s3.amazonaws.com/gifiz/53634572207.pdf
    • https://uploads.strikinglycdn.com/files/e669de52-512b-45bb-bb7e-4e3211777733/paripifewavimisikekefu.pdf
    • https://s3.amazonaws.com/guxosa/05_malibu_starter_location.pdf
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_e941b715f5dc4224854b9fb56d35f4d9.pdf?index=true
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_084427732c674ddd9817b50f8dfbd7c7.pdf?index=true
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_1b660828ba5e4dfbb4d7c41b5cd324fb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dcbd4e8f-5d6a-4116-9b40-5fd009a6e824/torugetorufosatov.pdf
    • https://s3.amazonaws.com/vokeri/blank_sheet_music_paper_treble_clef.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_off000108fd.bin
e2d467c78ba5ca5f832023cefb88b0f049dca86a83907571c3aae165d68f8eea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 5340 bytes
font_01_sfnt_off00011b3b.bin
ed02127d822181d27cf246a2a41b19cf6e6d74b14bd5d54f4a1f9577ed1e995c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 11392 bytes

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