Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff66994c071afa11…

MALICIOUS

PDF

70.7 KB Created: 2021-07-17 06:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 692224fceeaa58227c7f2ff2f9af6101 SHA-1: d492fb234e998a7ab58fed3360224a276ce4c0d6 SHA-256: ff66994c071afa11339d58afc5ce9cbee7874a9ba25108f52d631a9f0616d7b4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains multiple embedded URLs, one of which is flagged as a potential phishing lure related to educational materials. Although the document body is truncated and unreadable, the presence of these URLs and the ClamAV signature strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1757

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/pL_UGxDroB4/square?utm_term=thomas+calculus+12th+edition+online+pdf PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f093279d73d13cc78b3389/1626379047292/45977906783.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eddfdda0f2ca3483d22c6b/1626202077424/how_to_make_flying_text_in_minecraft.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_off0000b45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45A 15928 bytes
SHA-256: df591f5926430f88411bdcce712b3117fe55876049789b032109db83e7b85077
font_01_sfnt_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 11020 bytes
SHA-256: 49d7fb75ca1bb094540b6244176f999913283a40dc196381d3ed342d6e478aba

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