Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaa5f2b4cba0b5d…

MALICIOUS

PDF

84.9 KB Created: 2021-07-15 10:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7033753381d9bae8eb7d7ddba5919edd SHA-1: de19a3a7bced55df6d5e2548538774ff573aacee SHA-256: 5aaa5f2b4cba0b5d901500d4210578f1c33e57569467276ba614a65ed60d4d08
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a callback phishing lure, prompting the user to call a phone number. The embedded URL, https://oniceh.ru/square?utm_term=ada+county+roster, is the primary indicator of a potential malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8790

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://oniceh.ru/square?utm_term=ada+county+roster
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec88870cf33f708d7aeffe/1626114183942/93688685250.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e936015ebba154a8fcfb80/1625896449979/11574271756.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee4ffffc191471fc6dc996/1626230783956/77925750944.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8c382c151be53bc0b7727/1625867138125/mirovimewonubigugi.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee4721537273346e306751/1626228513272/post_c_section_medication.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e85e14c7770375079f6727/1625841172629/changing_non_modifiable_alimony.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee8c77db6052518ecaa79d/1626246263124/cunninghams_dissection_manual_free_download.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_off0000eaa6.bin
29df943bf42fd49dfb965e3072c8498a59e2a5e8334ceaaed82209d6340140b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 17320 bytes
font_01_sfnt_off0001184e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1184E 16792 bytes
font_02_sfnt_off00013065.bin
b009605323b058d64af1cd1c76bc4c572e186826279efbb749fd2803bc8494a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13065 10420 bytes

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