Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd33469df242952…

MALICIOUS

PDF

90.2 KB Created: 2021-07-14 00:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a686a0c61bd9f7ec31cc8e16cfd374d8 SHA-1: 026275f581dfc595afeb4866e65ad6ead84b07a9 SHA-256: dbd33469df24295220bcbcec0e16c8a7a437881c516916f387e23ac1ff33278b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. ClamAV detection and ML classification further support its malicious nature. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the embedded URL suggests a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7544

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://medvor.ru/square?utm_term=fifty+shades+of+grey+series+pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ecab0bf4b4775d04a312ef/1626123019480/39840538147.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e799e2d56f0f36126d71da/1625790946522/65291648259.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8f1b583ae0c490236ea36/1625878965964/what_to_say_in_myself_in_interview.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_off0000fb21.bin
6753331aa840085735e68a5d612918cc26366afccf1e06724e836e4cf09b3de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10720 bytes
font_01_sfnt_off000113a7.bin
a12049b0ae94d48fbb34357b5175863460b1380bf5d05f609989a71ecb56b78b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A7 18896 bytes
font_02_sfnt_off00014534.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14534 16792 bytes

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