Malicious PDF — malware analysis report

Static analysis result for SHA-256 812bb2d78c7de621…

MALICIOUS

PDF

78.9 KB Created: 2021-07-18 00:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8afdce40b91d4c961c6d2b50f17e0097 SHA-1: 09332b725cc83bb73d2b1ccd7fe9a5be1c895e46 SHA-256: 812bb2d78c7de621a14c4696cd7b8621749540087c45617435f10d4276f2d3d2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains embedded URLs, one of which points to a Squarespace domain, suggesting a potential phishing lure. Although the document body is heavily obfuscated and unreadable, the presence of embedded URLs and the ClamAV detection strongly indicate a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

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/IdU8rIDf9lQ/square?utm_term=top+10+tourist+attractions
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9285d6e267257943b1bd8/1625892957563/answer_the_following_question_in_brief.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f14a993d214e0c0782e2b7/1626426009496/hill_rom_service_manuals.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_off0000d4e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 16792 bytes
font_01_sfnt_off0000ecff.bin
2fd851145df0259edd75f55dc0bd2b43579ed946a9ddb81466b595b2e8419fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 10424 bytes
font_02_sfnt_off000104cd.bin
8c99ce17b0a11e04eaf66fefa8adf99e2f24d7979e0ebeee1735cdc6ca2a7a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 16696 bytes

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