Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc695a927aa23dcc…

MALICIOUS

PDF

76.6 KB Created: 2021-03-15 14:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d13ab437c1dde6e22c9df5e53e548b38 SHA-1: 2722111e2a79088b2a493a4a43b4e32e54830190 SHA-256: fc695a927aa23dcc63464af0bc29e706955beafb7ef4254093cc10314e698dfa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded URI pointing to 'https://dafemum.ru/award?keyword=annual+book+of+astm+standards+2020+pdf', suggesting a phishing lure related to ASTM standards. While no scripts were explicitly extracted, the PDF structure and embedded URI strongly indicate an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/award?keyword=annual+book+of+astm+standards+2020+pdf
    • https://static.s123-cdn-static.com/uploads/4469863/normal_6007b0d47f307.pdf
    • https://static.s123-cdn-static.com/uploads/4393485/normal_5febb2c9722a9.pdf
    • https://cdn-cms.f-static.net/uploads/4365659/normal_603f240b5982a.pdf
    • https://cdn-cms.f-static.net/uploads/4369143/normal_60220b3e7c2dd.pdf
    • https://cdn-cms.f-static.net/uploads/4418188/normal_60347b7fe098e.pdf
    • https://cdn-cms.f-static.net/uploads/4479433/normal_6025ff3e25ebe.pdf
    • https://static.s123-cdn-static.com/uploads/4370064/normal_600397c12ab67.pdf
    • http://budorasipugegib.22web.org/fanunol.pdf
    • https://static.s123-cdn-static.com/uploads/4472753/normal_5feb5219ec6a6.pdf
    • https://cdn-cms.f-static.net/uploads/4480598/normal_603c0ff44faf4.pdf
    • http://gakekasabikav.22web.org/resumen_libro_las_chicas_de_alambre.pdf
    • https://cdn-cms.f-static.net/uploads/4385620/normal_6049bb660c036.pdf
    • http://bumadodari.iblogger.org/kitodakotolujusiwube.pdf
    • https://cdn-cms.f-static.net/uploads/4471985/normal_603a56ef88321.pdf
    • https://cdn-cms.f-static.net/uploads/4470016/normal_6013ecebac45d.pdf
    • https://cdn-cms.f-static.net/uploads/4428052/normal_6032dcf4ab588.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4df5db22-bb4d-4279-90b3-670e8f19ed82/how_to_tell_liftmaster_model.pdf
    • https://uploads.strikinglycdn.com/files/3ae2c628-588d-4664-93b4-9f5f68853348/is_mi_body_composition_scale_accurate.pdf
    • http://banobozibijur.epizy.com/blawenburg_reformed_church.pdf
    • https://uploads.strikinglycdn.com/files/fb3d1f34-c80a-4b18-ba71-df6076bb756c/bavisorulotijesokibaxuj.pdf
    • https://uploads.strikinglycdn.com/files/357e1910-491c-4c1c-8b50-0d6b056db3d1/44271082079.pdf
    • http://xizokokov.epizy.com/vegas_pro_14_templates_free.pdf
    • http://desutowifikabek.rf.gd/how_do_i_reset_my_lg_hbs_760_bluetooth_headset.pdf
    • http://jezagap.epizy.com/scrabble_cheat_sheet_free.pdf
    • https://uploads.strikinglycdn.com/files/674906a7-90e0-4305-affa-d68bc04ef6cb/zuzuwikixubuw.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7c.bin
9659a54df24aaff7b58f50695b2c09a18dd5447dc375a89c0fba94b8d4f161a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7C 5656 bytes
font_01_sfnt_off0001009e.bin
7b9da60b122c1ac5943b92c88edbaa06d9b6daa448e914fc84b35026ad3b88b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 10584 bytes

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