Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a6065c5ae72f50…

MALICIOUS

PDF

80.7 KB Created: 2021-07-13 17:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5a4653ffac53da68557b19dc4c5c5b7a SHA-1: a9e5191778ea36f0d44d0c6aec0e957228851ffe SHA-256: b6a6065c5ae72f5042cea2e0212e273cfd4aef519db4d6be896c0151fdeb2916
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. It contains an embedded URL that points to a resource on squarespace.com, which is likely used as a lure. The PDF structure itself is also suspicious due to duplicate object bodies, indicating potential obfuscation or malformation.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

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/AnJPYMJXbyQ/square?utm_term=no+service+charge+on+leasehold+flat PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec84c3c268f363b086d93a/1626113219918/what_to_say_in_a_promotion_interview.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8e452db8bb141bad637ab/1625875538731/timaduwowuzuk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 17404 bytes
SHA-256: 9d5d77db8537b0da6275677ff8c9801b4c74a702519fb0abb1fd89de84e2e5f2
font_02_sfnt_off00011e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7F 10800 bytes
SHA-256: 4714b933bf25949beb333da2de541d80a0370558c6d74db1f16bd5ace923c465

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