Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f4153445f137b2…

MALICIOUS

PDF

89.9 KB Created: 2021-07-17 23:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0891b172d8939b2cb3d4e04f0dfabf40 SHA-1: f06cb7eaf1bb2977ff34d044a97f5053b8331134 SHA-256: 99f4153445f137b2bee53fa3da8bab373cebc03e569599d8ab32a4b96c99cbbd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. It contains an embedded URL that, while currently flagged as benign, is likely intended to redirect the user to a malicious site. The PDF structure also shows signs of manipulation with duplicate object bodies, which can be used to hide malicious content. No scripts were extracted, but the presence of an embedded URI and the ClamAV detection strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0812

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://feedproxy.google.com/~r/sq/ugae/~3/uzX87CUNjRg/square?utm_term=best+place+to+buy+flac+music PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e879e774000c7cf29effbb/1625848295345/how_to_play_multiplayer_on_black_ops_3_xbox_360_offline.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed2b428c96c6301f91a0fb/1626155842900/authentic_egg_foo_young_recipe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 10844 bytes
SHA-256: 98be89321565cee13fe994da6fb3cd855f69a1faf3ffb19e1e95a6d2248fe5dd
font_01_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 17152 bytes
SHA-256: 66fae36aa6e414cfb4484b607c4c45beabe1325c212c38fe65fdade4acf28b28
font_03_sfnt_off00014424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14424 16252 bytes
SHA-256: 6d568972154aa9e6553788066da68fe6d5b0b58db67a92e881fdc4c3770f4e1b

Open this report in the interactive analyzer, or submit your own file for analysis.