Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf22aecb38994fbf…

MALICIOUS

PDF

73.3 KB Created: 2021-05-25 04:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1daf74c9cf80aa967be08abe3c0aa8e2 SHA-1: 2086346fcd45f54756b099d3ceffa29e8f269f1a SHA-256: bf22aecb38994fbf2fc5cbb1e79151a0cf4b6546e00ea57776718af6a4dde9ad
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to `crewmak.ru`, which is likely used to host a malicious payload or redirect to a phishing site. The PDF structure and embedded URLs suggest it is part of a phishing campaign or a downloader.

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://crewmak.ru/uplcv?utm_term=simple+past+tense+negative+form+examples
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fff44cded2bb70a84c4612e6ac6a7779/59133313709.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qp4ietsgallsdioj3p8j3f4p1b/devetup.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/d589787be30c2fa4900e6e9d07bde3c5/93745655714.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608780ad878df---tozewenuwodogis.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/24814d7046a4c999d68998ede941a15b/91481707064.pdf
    • http://foto-klub.dk/userfiles/file/divujojanowupusi.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/101775c043049c86538a1a8a5fdf4893/wiluliwosusoripire.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3588ece895c88aff60a9c6f02bc7ec26/pokemikomizorajegedoduzar.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c93327536---gukekajozowogowogafato.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b385343a---telebux.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609737fbdd1e7---92140898923.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e05116f54---79198182535.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d4.bin
ab76ad58c0f7613875cb10afd86aba7c76fadafbc72ae1b43c639ecb02fc8224		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 5240 bytes
font_01_sfnt_off0000e589.bin
0980a182874d4593ea5f5b6d841eeae187085574c2cfbc3117ccbb28dd5be992		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 10656 bytes
font_02_sfnt_off000109c4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 4324 bytes

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