Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ccfd6dc491779e2…

MALICIOUS

PDF

79.6 KB Created: 2021-07-12 21:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc5ffd5e63e33fe497e7f3d1c5bed53e SHA-1: 2409c7fb130bbc5258bfd74a9955c8813dae5c9b SHA-256: 7ccfd6dc491779e230e8f750e39ed322db60aea4f92868e5dc619adaa619c4a6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content. The PDF structure itself contains obfuscated data, and the wkhtmltopdf authoring application is unusual for a typical document, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6279

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/razvivatel/yapz/~3/XMoLd4EPXkg/square?utm_term=eye+muscles+cranial+nerves
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e79beff29cd6423db0d30b/1625791471859/lower_bound_and_upper_bound_polynomials_calculator.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8bc640c1002185596f374/1625865316939/meaning_of_the_word_obligatory.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec819a31b0b43e07e6a356/1626112410380/16669379497.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79979efb14d11220d6cf0/1625790841603/bumupuwevo.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_off0000d71f.bin
060d22bb52e3760967427389b16840193b3ee09e088e0b161be928e09acff3cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD71F 16460 bytes
font_01_sfnt_off00010181.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 16792 bytes
font_02_sfnt_off00011998.bin
37263a18b8e0d95b4184a0b0b2c5f72f3c2b4b7aa6c7b8da3a3fe6eb533a90c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11998 10436 bytes

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