Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcb3d55ee0d3d67…

MALICIOUS

PDF

82.1 KB Created: 2021-07-19 09:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0b499204bbe44e6e3b74df596f18d6e SHA-1: 6e6bbbd658b09dd3e90268b6f3315ceac853cf83 SHA-256: efcb3d55ee0d3d67c6aafd1b23733d5f975daa87ce686caa2b8671635ce6c22c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to potentially harmful content. The PDF_URI heuristic specifically points to an external URI, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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/NsX9ihectO0/square?utm_term=dominique+fishback+the+hate+you+give
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f49d75ac77840235798b25/1626643830048/knuckles_and_blaze.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e836cdadf2c268820467c8/1625831117720/porupepuxesemagexajivo.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f002ce97dca740078dc039/1626342094325/swagger_json_to.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f06493be875f230105d8b8/1626367123344/5760165473.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec827dc8b0d544b6d78685/1626112637582/wwe_2k18_download_for_android.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e91f34f492d21a0f6ada78/1625890612791/wusapokurup.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f3c43ca8f65e35b6de2627/1626588220323/51801243928.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f36714db752c5e49acd767/1626564372462/what_do_italics_look_like.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7853155092d783c61a0e7/1625785650109/dunenugafufi.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f198c2b7d40712ccd8d0b4/1626446018719/factors_and_multiples_worksheet_class_4.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_off0000dde7.bin
5109638f308fdf0b991aa9d17208d0aac8e375ba4cf0ba3fe7feb1cec5e33db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE7 16924 bytes
font_01_sfnt_off000109dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 16792 bytes
font_02_sfnt_off000121f4.bin
aa186d2bac9086a39f4aedaa91baebb193db6c78bbcced98754d627cf2a7a751		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 11296 bytes

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