Malicious PDF — malware analysis report

Static analysis result for SHA-256 e364ee15f44967fe…

MALICIOUS

PDF

75.6 KB Created: 2021-07-13 09:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5335e8a5151de0b84c6f64299a0b8ee5 SHA-1: 3425adeb7e2ecd578ab5dafc174095710428888d SHA-256: e364ee15f44967fe3a3f8dab4bc100cd6ff60537e477e58133fccc1b354f4cb9
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan, indicating malicious intent. The presence of embedded URLs, although many are confirmed benign, suggests an attempt to lure users to external resources. The PDF structure and metadata, including the authoring application 'wkhtmltopdf', do not provide specific indicators of a known family, hence 'unknown family' is used.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/XMoLd4EPXkg/square?utm_term=the+lost+sheep+coloring+page PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7e0dc268f363b0863391/1626111501780/3744780151.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e82fc6bab06216133bcd53/1625829318213/hybridisation_of_n_in_nh3_is.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_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 16048 bytes
SHA-256: 6510d94daecbc44c53e761d9c3559947ad0fb7fa8a0beb6ee2a5eb2e4866383a
font_01_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 10616 bytes
SHA-256: c56773e2107824fff3918b417eb55cf7f5d150d28ca2b1dc1a103372dec0ee4d
font_02_sfnt_off00010af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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