Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb603637a39cc55e…

MALICIOUS

PDF

114.8 KB Created: 2021-07-12 21:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7ad20d51240338032fddbb1c7d4ebf39 SHA-1: 7f303ba11231ac8de7733e161ea564f575d93abe SHA-256: cb603637a39cc55ee1309cfa415035f7d48c51f06b4aafa6ed2da41be13d465d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating a phishing or trojanized document. The presence of embedded URLs, even if currently flagged as benign, suggests an attempt to redirect the user to malicious content. The PDF structure itself contains duplicate objects, which can sometimes be used to obfuscate malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier clean score 0.1308

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/razvivatel/yapz/~3/4Ji06Fp1PxY/square?utm_term=manual+testing+faqs+with+answers PDF link annotation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8d18fa5e1975eb392c592/1625870735292/how_about_a_writing_a_good_research_title.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_off000165d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE8 16040 bytes
SHA-256: cd483fd03983124b00b1bd27f8956e8f85b603e767d4f36c675de47385a40b7d
font_02_sfnt_off0001a744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A744 10696 bytes
SHA-256: 39fcbb77b891553b0e0faf302c3278fa60b43b8c1605ddb0ee5702f3055da711

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