Malicious PDF — malware analysis report

Static analysis result for SHA-256 888c2a4c7be1cf05…

MALICIOUS

PDF

78.4 KB Created: 2021-07-21 08:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 314e2e63079d48043b92dd2145f9810f SHA-1: 0c1a4da7df4db89d9855309ce3ffaf19b930f7f6 SHA-256: 888c2a4c7be1cf0573e12431d6d45f2eb4e25374b3951f35d38b7eca3e165006
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a URL that, while currently marked as benign, is part of the attack chain. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of embedded URLs and the overall malicious classification suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8755

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/~3/7R6buoffwiA/square?utm_term=european+tv+channels+live+streaming+free
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f41fa3d9389f5e8095524f/1626611619583/98788892739.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f372cb6d5e991e36e1ce25/1626567371198/fokulazelotojusasilorodi.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f33387c2d40e67ec096c16/1626551175475/88349361058.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f30ad5ebca9b5ae8e85fb8/1626540757629/write_first_three_common_multiples_of_12_and_18.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f36355c5d9e6782ce28330/1626563414116/quadriceps_muscle_pain_above_knee.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee86781cf0e6777f328162/1626244728416/myeras_sign_in.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f2c4c9503a2167178ac499/1626522825759/people_lying_in_bed.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_off0000d11a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 16792 bytes
font_01_sfnt_off0000e931.bin
33ab07d1eab217e0cc0239a716ab219b919845b26d1e4cdda19d1b0158963e42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 11076 bytes
font_02_sfnt_off000102ca.bin
d68c03748cd12eb5d8705350d4ea31a7c090d95bb0a48dae0ee825edbe5371f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 16440 bytes

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