Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b4ff473e1abea5…

MALICIOUS

PDF

89.0 KB Created: 2021-06-28 13:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 392c52d1d067ddae6d626b475282b1fd SHA-1: e9682d24439a37d9ca0f7f8631ea0652a7fa4bb9 SHA-256: 65b4ff473e1abea5f52d12f82d2f0f7b789a244463c0c90b36722eb750fb892a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'irlanc.ru' suggests a phishing or credential harvesting attempt. The 'SE_URGENCY_LURE' heuristic further supports the phishing pretext by indicating the document uses urgency language to prompt user action. No scripts were extracted, but the PDF structure itself likely facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=happy+birthday+wishes+for+brother+in+law
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091f710e4925---97851556891.pdf
    • http://mcutech.net/upload/2021/06/file/16236871031891185360.pdf
    • https://holocaustresearch.pl/nowy/photo/file/7480363542.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdd7de5275---bokewumovewateme.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcec4bdfc0---95136380369.pdf
    • http://tulsamemorialclassof71.com/clients/84987/File/17221451243.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/ecc9362b6d33c54b14f6b1d0c3b31dc6/wozare.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bn04crgf4m2vstt5gjnd4lish5/gaweberume.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa1223885---53250251799.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e87d1de329---jurobur.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3accd8938f4073f815456c0a5b275f59/48143981159.pdf
    • http://www.heksan.com.pl/file/wiwuf.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090924abe2a3---zozujewalegubuj.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/jdadhfcibo687jlpastn1rff0e/34725202659.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b23778f061---loxoxojotokorokaj.pdf
    • https://riondene.ch/img/uploads/file/bogubigugewosizig.pdf
    • http://cpspcb.com/uploads/files/jifilaxekawokogogaxirewab.pdf
    • http://aeronautike.com/userfiles/file/27076754152.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c4a18c9890c74154624f146dc2bc79f0/wizuzud.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/80b845d82a76b27ded2f25f682a36d24/zuzakimusebaweb.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c4e0e4cb3104858754b7e66a8cb2c94b/20758545506.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7a28141b4a0dbb596aa2893ac472569a/89571119673.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_off0000f463.bin
94b44e80adbe330464425e49ef1f158fca4e57b72daa504dde7be2da92ca43b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 18004 bytes
font_01_sfnt_off0001239b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 16792 bytes
font_02_sfnt_off00013bb2.bin
0ab6d27d15a2e3f5289e8d3d6a58adf8a161edf443e1ebcc5f78ca5eb017d1a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB2 10924 bytes

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