Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0283bf9871aa76…

MALICIOUS

PDF

75.0 KB Created: 2021-07-16 07:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9568428deef20b9b0e4d9d29d53e4922 SHA-1: e5300b783f41fc79dee5383e252426ee5a0688f7 SHA-256: 4a0283bf9871aa767f1337b6d657310c6c18269182dc38e1b5d00b3b00f13d27
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. It contains an embedded URI pointing to 'wastran.ru', which is likely part of a phishing lure. Although no scripts were directly extracted, the PDF structure and the presence of an external URI suggest an attempt to redirect the user to a malicious site for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2580

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://wastran.ru/square?utm_term=common+size+income+statement+problems+and+solutions
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f0472d365a201d3c3db7ec/1626359597262/ploidy_in_mitosis_and_meiosis.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca36e45711547b6a95e2c/1626121070893/counter_ion_definition.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_off0000c28a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC28A 16792 bytes
font_01_sfnt_off0000da9c.bin
158c4fc970b8c55ccadb2ee19b52613f12dbfbbf57caab05edbdd57c426700f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 16856 bytes
font_02_sfnt_off0001066f.bin
ccb0e1e0c69b16f3655a6b5d3da3cf393a87f65f9d6913da16b5fff73dbb5093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 11004 bytes

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