Malicious PDF — malware analysis report

Static analysis result for SHA-256 835e4b13ea992cff…

MALICIOUS

PDF

85.8 KB Created: 2021-07-13 02:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a009fc2f36c9034420eb407bb67c571 SHA-1: 287aa72a893e8aef0e6ebe7f33f66903f02783d3 SHA-256: 835e4b13ea992cfff5e5ad7426083aa732a49570539dad3fef6665e0011de683
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded URLs, although many are confirmed benign, suggests a potential lure or redirection mechanism. The file's authoring application, wkhtmltopdf, is unusual for typical document content, indicating it may have been generated programmatically for malicious purposes. No scripts were extracted, but the overall detection profile points to a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6359

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=beverly+capps+burgess
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecb70978f7f62a374fd953/1626126089478/12351701682.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e961b7fc46b1505829d901/1625907639130/if_i_liked_little_fires_everywhere.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e93354fc46b1505828a71c/1625895764226/why_does_my_peace_lily_have_green_flowers.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_off0000f07c.bin
3151eef32dc6b9a2ef10bf08a04a8a6149ba2bede7e5c102482463d0031d1d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 16432 bytes
font_01_sfnt_off00011b53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 16792 bytes
font_02_sfnt_off0001336a.bin
17bbc2eb1e8b9d29e7f200100b102caccd8bbffed0099c913f04f21858a9c019		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1336A 10608 bytes

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