Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a8e8fb5914c52a…

MALICIOUS

PDF

76.9 KB Created: 2021-07-16 01:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63e8de76b442a6b9cd0a3bca9c45f2fd SHA-1: 8e16b05f98897259d582f4b934dad8dfc5e82979 SHA-256: a5a8e8fb5914c52a73bd8b9bd7ee9009bb76591dc23a0a7f10732efe65513656
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, though many are marked as benign, suggests an attempt to lure the user to external resources. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall detection points to a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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/~3/5JeRQhMeIYg/square?utm_term=the+phonological+awareness+test+2
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecb3c0522a83061658dff5/1626125248866/jamutodalo.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8eba21448b06198462100/1625877410051/who_should_we_hire_you.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7a75c872c4c6263c217f4/1625794396128/woxumoseluvosigewekekaw.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8ca08351081123f7c2c6e/1625868808300/kovanadabikal.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7d75248fdc25940409d20/1625806674851/i_can_count_on_me_like_123.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_off0000ca35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA35 16792 bytes
font_01_sfnt_off0000e24c.bin
c0a5f8fbd6580e6646af62d6c41fa10724a37a65630519510ce238b691ccd5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 10824 bytes
font_02_sfnt_off0000fb5a.bin
ff8d2938bd8fb7ec5d1210cfc770121b6788834dbb89a3282873cea8f10f4e17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 16940 bytes

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