Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b98255233b9e55…

MALICIOUS

PDF

79.4 KB Created: 2021-07-14 00:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0200521c79e49f3d5a8d63934a845b24 SHA-1: b5fd665b59d2e6deca791dd31c49244e18f8f03a SHA-256: 99b98255233b9e553572a33fc349e0c7a2981ec6decc975649cf51f4e32c632d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by a machine learning classifier and ClamAV, specifically flagged as a phishing trojan. The presence of a visual download button and an embedded URL promising game cheats indicates a social engineering lure. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded URL suggest it is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/square?utm_term=dragon+city+hack+download+unlimited+gems+gold+and+food+2020
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e90be52210ba6bce115188/1625885669367/hardware_components_of_computer.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec924e7dc7460dd09c0796/1626116686765/65889884587.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7e7884454ab0ddd866f41/1625810825009/2_files_in_one.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_off0000d292.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD292 16792 bytes
font_01_sfnt_off0000eaa4.bin
21c29734d50279faf0e4e547080bc38e3eec10ebd203d91870158b417a0297f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 16740 bytes
font_02_sfnt_off00011636.bin
827a0003b3fe995fb21256f4d084d8ab3472a63c73eacb259ba78c9b42b71060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 11560 bytes

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