Malicious PDF — malware analysis report

Static analysis result for SHA-256 557dae5657c202f9…

MALICIOUS

PDF

73.4 KB Created: 2021-07-17 02:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 980c4c416b5ec60323f5480b768f54c3 SHA-1: 0d02860acdbbbcca282f89e7d22028b3ebee9965 SHA-256: 557dae5657c202f93218be2c87a50d639cadc1c0598db8b031dcc93c9d4a636c
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 high likelihood of malicious intent. The presence of an embedded URI suggests an attempt to redirect the user to a potentially malicious site. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8728

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/qI_NY8u86tA/square?utm_term=cranial+nerves+definition
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e92c2792abcc18c4f66e02/1625893927536/bivugekeweku.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee8dd5df274736e0afe391/1626246613629/purigorotiwudenow.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e77d9dd8290f3ffe9a1e30/1625783709878/ibs_and_fatigue.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f1f821d0cbc11ff88325d6/1626470433743/jimmy_james_female_impersonator.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f1fc452516006cc691c8a6/1626471493318/differential_equations_10th_edition.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee6db7b27e5958d59243ff/1626238391380/74317106597.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1c894024ace57e52c8108/1626458260798/33620140038.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_off0000c260.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC260 16792 bytes
font_01_sfnt_off0000da77.bin
ab94d83a292d6cd8ab203c9a0f92ef53034a900e82c293ae1d3e004a0871766c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA77 10444 bytes
font_02_sfnt_off0000f24b.bin
17506cb508bdbd85c148f2d594909613e6874598ac526edbb260d1d49c671ad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 15404 bytes

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