Malicious PDF — malware analysis report

Static analysis result for SHA-256 4037db0549bc5c59…

MALICIOUS

PDF

84.6 KB Created: 2021-07-16 20:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b016a14fa1e3c0f31070a6419de727f SHA-1: a42c76f35b5fdeefaf4069a3602af0251e793ed7 SHA-256: 4037db0549bc5c5918d24c69498e9e8799a7a85272228e984a5f85130a192239
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. An external URI pointing to 'https://krisoc.ru/square?utm_term=divinity+2+character+builds' was extracted, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URI are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8224

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://krisoc.ru/square?utm_term=divinity+2+character+builds
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eda7cb3680ef421b55b69b/1626187723224/devewojulufasezovejawusis.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e768aef4d66f229d3f7213/1625778350488/sopimifejevulifojajamop.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7efe16e46386ca3c178e5/1625812961371/jorukowij.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7e0b19a16f038d61bee8/1626111499822/69150906892.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e776e5639fd3490b8f05f3/1625781989781/how_to_hold_a_bass_trombone.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f14e8ac9cf4d40000d4b46/1626427018427/how_many_calories_in_200_grams_of_cooked_white_rice.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_off0000ea96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 16792 bytes
font_01_sfnt_off000102ad.bin
c1a0f481b1d15112e9efd46f4adb96a81d13f37d17aed89f2f69ea5d64183720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 10888 bytes
font_02_sfnt_off00011be7.bin
35bacf5d6999bf1059fab7c61b46b2422849ede02e3a2a049655e43fd34c99fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 16444 bytes

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