Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4a76f6378f99b1…

MALICIOUS

PDF

80.1 KB Created: 2021-07-13 16:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7c5dc38f8cfd3ce58913f65cdbb062d SHA-1: a691d69062a13a962451111e780b9fc5977a94c9 SHA-256: bc4a76f6378f99b165091a76e4931bfab4bb566b6d5a6412c8a699bd7c497ea4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded URLs, even those labeled as benign, suggests an attempt to direct the user to external resources. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall context points towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8365

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=well+life+is+too+short+so+love+the+one+you+got+lyrics
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e0598915684aa5398791/1625874522037/letter_to_the_editor_format_class_12_cbse.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7b747d56f0f36126f3da5/1625798471543/tokudemugedibuwibisudupu.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecf3d5c76d6b0ba0081431/1626141654613/kezugu.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed927dbc9b4721000f309e/1626182269773/rikewukaxerirutovasirewiw.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ed8c880318596fdcc50718/1626180744486/excessive_yawning_after_eating.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_off0000d6cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 16792 bytes
font_01_sfnt_off0000eee2.bin
019e5bdae1d84922525c8de7f419458f593480e69a9515b61d476b9e35846b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 10728 bytes
font_02_sfnt_off00010793.bin
3a32a5798252bfa064db0013601698358115dbfae374567274923406a9895337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 17080 bytes

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