Malicious PDF — malware analysis report

Static analysis result for SHA-256 a090c8172c7f12f9…

MALICIOUS

PDF

88.1 KB Created: 2021-07-18 16:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fbf1ef36619a82f345f08fcd199ee55 SHA-1: fbb568e07adb07c8d83aa7e85083a34bec5244c1 SHA-256: a090c8172c7f12f98f1999a53a05490cb1141e1a72b2c26d9566015a76c43f71
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains an embedded URL that directs users to a site seemingly offering software product keys, a common phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were directly extracted, the presence of an embedded URI and the phishing lure suggest an attempt to redirect users to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1448

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/gPkW7oTCsL0/square?utm_term=xp+home+product+key
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f15cba1c98e64adeeaa0a0/1626430651180/rounding_to_thousands.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e81795ba333063f17af04b/1625823125965/an_introductory_english_grammar_stageberg.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_off0000f7de.bin
55cc1b9ea64492d163125fc9d795fee27a6f6d714fcebb5cb44b83824378098f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 10520 bytes
font_01_sfnt_off00010fd6.bin
775607626920fdd9c0757cecde164e25139adb84b5693840f17893c6fff2671a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD6 17272 bytes
font_02_sfnt_off00013d16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D16 16792 bytes

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