Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e31755b289d493e…

MALICIOUS

PDF

76.0 KB Created: 2021-07-15 08:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0074df59fb9a962386270950630d0a77 SHA-1: 99b62d674932f7870f588782ddca0e48ad000e4d SHA-256: 5e31755b289d493e07f84aecce3e1f74343ec9312b253265f02b77b90f35f0c6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The presence of embedded URLs, though many are confirmed benign, suggests an attempt to redirect the user. The document body is heavily obfuscated and unreadable, preventing a clear understanding of the lure, but the overall structure and heuristic firings point towards a malicious PDF designed to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

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://feedproxy.google.com/~r/sq/ugae/~3/RVI1sXQGPkU/square?utm_term=yesterday+fingerstyle+tab+pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed0bca4918f36a6d5bc029/1626147786621/we_stand_and_lift_up_our_hands_for_the_joy_of_the_lord_is_our_strength.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee4ff42af4c01978fe104e/1626230773038/31841505290.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed43120318596fdcc16f1d/1626161938564/docker_in_practice_2nd_edition.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8e19dcc7c086459238664/1625874845878/bufijurowixawa.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8452e74ba94069847af43/1625834798792/rujageriwob.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec824b950202184f106ab1/1626112587819/vomedawobokibada.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_off0000c641.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC641 16792 bytes
font_01_sfnt_off0000de58.bin
f166973c5bca7d644514ca6dcc70772ff35f30109cd8406ec3b0673161556a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 10788 bytes
font_02_sfnt_off0000f6de.bin
803329e1265b0ea7b9c0bb4d54437de2860f4df35f34fbbf95b8c338da0dbed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 17276 bytes

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