Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f90b985de72358…

MALICIOUS

PDF

89.6 KB Created: 2021-07-18 01:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4995b1dfc5403f3f6be0974f781c7c5 SHA-1: 43e84de88eb2625d1b337059487e3b8a7510447e SHA-256: 22f90b985de7235887699d9c3aa3b9eb3b5694c19b7ca4ae06e6a4cf4757538d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains embedded URLs, suggesting it may be used for phishing or to redirect users to malicious sites. The PDF structure and embedded content, though heavily obfuscated, are indicative of malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8615

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/ZV5PD9BTPXI/square?utm_term=three+example+of+unicellular+organism
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f3495651c2e860984f9d14/1626556758277/gta_5_mobile_apk_android.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f34d4d7f94c710fbc58aaa/1626557773750/76375345023.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee8ae733d4654651c172be/1626245863120/39497866552.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edfbcdc6126f45c3e523e0/1626209229425/why_does_distilled_water_have_an_expiration_date.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f01ecbfd683a7867cbc3b5/1626349259278/astronomers_in_space.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed92ee9db072196a243e60/1626182382815/wh_to_hours.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f2f917db752c5e49a71de6/1626536216192/49925578632.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_off0000fa34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 16792 bytes
font_01_sfnt_off0001124b.bin
a4ad5a132672de421da07be1a4c31efe3d627a97859478dedc55943c757dc288		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 10992 bytes
font_02_sfnt_off00012ba4.bin
99eff31c24572f10095e3bbc150208bd1e755d0f12296cc14db9258d34d2bbf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA4 18228 bytes

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