Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c43d249686ba09…

MALICIOUS

PDF

76.7 KB Created: 2021-07-16 23:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72090af1bb4236740c4247a2db6b3267 SHA-1: e01c0bf37dfbdd86a70337d319ae747c8eab0652 SHA-256: e0c43d249686ba09f40cf73808ef04fe373a917b8966f8405241a9a977f528e3
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of an advance-fee scam. It contains an external URI pointing to 'krisoc.ru', which is likely part of the scam infrastructure. While no scripts were explicitly extracted, the PDF format can embed JavaScript, and the presence of external links suggests an attempt to direct the user to a malicious site or initiate a fraudulent transaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=java+oops+interview+questions+for+experienced+professionals
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7863e6e9faf03c7221a05/1625785918054/72051930996.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee87327426fb5109f8b723/1626244914471/zubaxerisedobev.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eda550cd5f69124b41d982/1626187088894/901319539.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f03b1d97dca7400790a8e1/1626356510245/proofread_lines_of_code.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_off0000c82e.bin
1229cd6256c0ec4724149966fa6e4a672aa8b24a38c4c32c7ba37beb3d521202		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 11104 bytes
font_01_sfnt_off0000e21c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 16792 bytes
font_02_sfnt_off0000fa2e.bin
2abe08b1f8507668c13669a20a3bd1475ca3357a96f3f03ac13d0e100f56695c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 17040 bytes

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