Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f79ab8c88a07ec…

MALICIOUS

PDF

78.7 KB Created: 2021-07-17 07:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ab14c7caa5161c12643cae05bb5a6f3 SHA-1: cdeabe4d36e9368a163c124ff70915008e746c80 SHA-256: f1f79ab8c88a07ec131d826bf9f04a0d51cdbcf530755310c460c866a8170418
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or credential harvesting attempt. The obfuscated document body and the use of wkhtmltopdf indicate an attempt to disguise the file's true nature, possibly to evade detection or trick users into interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8187

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/sq/ugae/~3/J-SxIuB37Ms/square?utm_term=simple+farm+tools+and+their+uses+pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec78d082b4c978cf407d8b/1626110160191/industrial_electronics_lecture_notes.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7722bdd82073f6fdc4b7/1626109730999/xened.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8cc71d8d5997ba4e657e4/1625869425171/19166773054.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f11068b238236d23321c38/1626411112374/dojonijigabadib.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7b6c84454ab0ddd84261d/1625798344409/mevepewisuzatagujebosaxon.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee89982a4cda1762621747/1626245528638/59419924392.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_off0000d0b3.bin
32b8daa35e2e9c99f1aa199ab10c9684ee9e8926fe01db9b26b726b44f943573		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 10940 bytes
font_01_sfnt_off0000e9c2.bin
5930cea67639dc75d6708618518dd3958131bb5da4861fcf26e0b9fe27910656		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 16512 bytes
font_02_sfnt_off000114c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 16792 bytes

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