Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d5ef48fe0086f5…

MALICIOUS

PDF

78.9 KB Created: 2021-07-16 20:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a5911498f9e756150004141d6abf5a8 SHA-1: 7b590e17df3f18a73974282a321dc48be37188ff SHA-256: a4d5ef48fe0086f55067479122fbea7a75fdbbe4e91d725c2f539cdcb57fdc9c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'huntic.ru', which is likely a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to malicious content, fitting the pattern of a phishing attack delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8755

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://huntic.ru/square?utm_term=gnocchi+with+brown+butter+and+sage
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e818f81d61f435cefa6445/1625823481119/22819644198.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e874bc7727436ecd345471/1625846972425/s2_made_in_abyss.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60efebaa1a40e7189050e614/1626336170836/how_do_i_draw_in_word.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8eeeb0cbdad4d3503b73d/1625878252090/passive_transport_in_a_sentence.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1376d69d2312025746ab7/1626421101478/wusinemaxajefenox.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee71c92ee8b51fd9386b74/1626239433867/67910190282.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0dbad5d599800102ad662/1626397613349/mudizinufejoduvefo.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ee.bin
e24b5bffbd0e02a6d1c3b6cfb6e0866118afe65de243be9b6abd48d42976acce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 10968 bytes
font_01_sfnt_off0000ec35.bin
5de3dbdc4a9f0a1e3b9aab5240162846b979765eac672c65dbdfa20224b75774		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 16708 bytes
font_02_sfnt_off000117b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117B2 16792 bytes

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