Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45b496734616411…

MALICIOUS

PDF

75.9 KB Created: 2021-07-13 17:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 092843988e051843ee0097197894ece1 SHA-1: a3d0cdf10bcbb0eb3ef4451200e5b5882eb43915 SHA-256: a45b49673461641142caaa2c9b6ffd18079e3a1374b873db2639cfaeeeecc7f6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojanized PDF. The presence of embedded URLs, even if some are marked benign, indicates an attempt to redirect the user. While no scripts were explicitly extracted, the PDF structure and the heuristic firings point towards a malicious document, likely intended to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier clean score 0.1538

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/~3/0YvHz_IItD0/square?utm_term=question+mark+and+comma PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e91dbb12fb7d0b27934680/1625890235278/photoshop_tutorial_in_tamil_download.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_off0000c6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 17152 bytes
SHA-256: da85589afb28368d5a31f8ad40e3649e869b525e4795f4ea0f61f12637f0d64e
font_02_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 10736 bytes
SHA-256: 599d6c213c016b4d28c7e69a717ec32bcac6a406235c13b19d1da085c87e685f

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