Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ad06c6b78c38ca…

MALICIOUS

PDF

81.1 KB Created: 2021-07-12 21:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f94118a599fa2c79833c9d5ad50fb025 SHA-1: 73e3ad3e77648e226d00c25383f88be064bd8f86 SHA-256: a7ad06c6b78c38ca1f4e0746da3df121b5fc1b675a38fc6718234c9211c70cf1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'catamma.ru', which is likely part of a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to direct the user to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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://catamma.ru/square?utm_term=how+many+elements+did+mendeleev+have+to+put+into+his+periodic+table
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9483a320dbd0de28237bc/1625901114974/need_for_speed_rivals_ps4_2_player_split_screen.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8ec9566be7e490f0d2416/1625877653412/walking_with_beasts_2.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec789ac217102653d50614/1626110106667/kamozizugaxug.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7f19823621b4743e4e659/1625813400164/how_to_find_the_highest_common_factor_of_two_numbers.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e9433ef107ff2467ea0f2d/1625899838645/open_office_convert_doc_to_command_line.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_off0000d905.bin
c8123494f2ac9923c3ba437c30d050b0c7a69867f030c5d4aae4633b55549da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 17124 bytes
font_01_sfnt_off000105c4.bin
2a4798fab365e9f75c76cf154e930a8791af6c55ff6b34801e8174354c9de8ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 11276 bytes
font_02_sfnt_off00011fd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD8 16792 bytes

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