Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cdddf4571e8dbb…

MALICIOUS

PDF

78.7 KB Created: 2021-07-13 05:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d64e628d4ed4e7d5fb8856d2800fc652 SHA-1: f8fbc61ea3d1c98c3a37aa4dadfa5fa5520ec123 SHA-256: 31cdddf4571e8dbb54a27679685e0ec09cf0f8036bba8fc52d5e37aefd73da84
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded URLs, one of which is associated with a phishing lure. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest the document is designed to redirect users to malicious sites, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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/~3/9xivtwLAy4k/square?utm_term=sql+interview+questions+and+answers
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ece1440124a666ff3c64ad/1626136900442/crooked_smiley_face.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7c59386d8930991a53ad7/1625802131783/57346921059.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8b09fe047727940c6ff4/1626114825350/anti_federalist_government.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e810286e46386ca3c2ba75/1625821224195/national_building_code_part_3.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ecfcbef84adf285bed2dbf/1626143934459/lol_diva_coloring_pages.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e1ed27127e68041263ea/1625874925591/whether_and_if_difference.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7afbc5c1b8460033c7270/1625796540275/weather_in_burke_county.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec939f58d864752e026aab/1626117024014/fogadipowebem.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60eca6e21cff58014d573db7/1626121954635/67124231588.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_off0000d340.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 16792 bytes
font_01_sfnt_off0000eb57.bin
e7e269f0fb9222c4ac12eb44664f39429a319515c80bcf4a644f8e9bd329fdd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 10712 bytes
font_02_sfnt_off000103e4.bin
ce2b003ff2ac1cb64f9aaf75aa4e5f7c226eb977e991ddd08b1b9a29fb554530
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 16592 bytes