Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbd67bc224e9ee4…

MALICIOUS

PDF

78.4 KB Created: 2021-07-12 20:39:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 674d7ea3b01b7c341307e10b023ef939 SHA-1: 0fa04790c16a15ced6ecfdfecf9c197165574b6a SHA-256: adbd67bc224e9ee43800fe8040a4c7800f514efc3c73d579a427a4c3780bde01
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The file was authored using wkhtmltopdf, which can be used to generate PDFs from web content, suggesting a potential phishing or malicious content delivery vector. No scripts were extracted, but the presence of the malicious URL is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

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://ketchas.ru/square?utm_term=nightmare+withered+toy+chica
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7ace75eabb22f35d83061/1625795815760/xujivulibotebufunifunim.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7d1b838ed220952ad2ae3/1625805240582/chemistry_chapter_4_review_answers.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_off0000d34f.bin
770b25e87410756f06108efebac5edf6d395e888f3f2f8ae9e4f9873994ca19c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD34F 10676 bytes
font_01_sfnt_off0000ebac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 16792 bytes
font_02_sfnt_off000103be.bin
dcc5c5af361274cffc536d83d53d6749b2af519cd7e0efe4960f23de7b122f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 16372 bytes

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