Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01ff5e01a4391d3…

MALICIOUS

PDF

77.8 KB Created: 2021-03-24 01:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a792e1e3f1425958a0ac86a59413aae5 SHA-1: 85d317ff619a8eb15e26b7e3bf8fc175bf12ffa6 SHA-256: c01ff5e01a4391d32f49967f3c5add833230f8f9fea1bd4c85683118cc4512e7
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to grammar exercises, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=relative+clauses+perfect+grammar+exercises
    • https://didefitelov.weebly.com/uploads/1/3/0/8/130874246/4319063.pdf
    • http://letekidela.iblogger.org/google_chrome_spell_check_dictionary_failed.pdf
    • https://lonegaru.weebly.com/uploads/1/3/0/9/130969637/333b3501d.pdf
    • https://mofutobanu.weebly.com/uploads/1/3/1/3/131383854/1931483.pdf
    • http://insurancecarusa.com/vudofonigufofetaliwejzww.pdf
    • https://cdn.sqhk.co/denobafopum/SicggtF/69871854402.pdf
    • https://cdn.sqhk.co/mitukutowum/7gfjfgh/street_kart_racing_free_download.pdf
    • https://wenojobopowegit.weebly.com/uploads/1/3/4/8/134879608/fagufet.pdf
    • http://s7hmus.org/free_printable_compass_rose_worksheetpksqn.pdf
    • https://tamexixufose.weebly.com/uploads/1/3/0/7/130739892/aaf65f26fd352.pdf
    • https://cdn.sqhk.co/goluxewimabu/UiiAGig/13434521411.pdf
    • https://cdn.sqhk.co/bovokolel/mhaegiW/jitud.pdf
    • http://urro-hu.com/tuck_everlasting_chapter_questionsmmq0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ce426115-dd47-4707-89e0-416f7a2bf394/probability_of_simple_events_worksheet_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/cc2d39ed-e244-4f54-ae2f-04ed616664ce/gaditikubodim.pdf
    • https://uploads.strikinglycdn.com/files/596035f4-3497-4ce7-84d2-9f2a1051c4da/how_to_trade_using_fundamental_analysis.pdf
    • http://jobubiro.epizy.com/72572086591.pdf
    • http://kegefuji.epizy.com/nadiwidemef.pdf
    • http://raduniti.epizy.com/violin_sheet_music_beethoven.pdf
    • https://uploads.strikinglycdn.com/files/5a348913-daab-4b6b-8072-83245c6ffef9/lenerivapejeduzeleb.pdf
    • http://befakugidutoj.rf.gd/blenheim_high_school_uniform.pdf
    • http://jekiwoko.rf.gd/sofasajupuvix.pdf
    • https://uploads.strikinglycdn.com/files/b76e568d-94eb-42a4-a336-25123f9d21a3/what_is_the_difference_between_metro_redux_and_metro_2033.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_off0000f2d5.bin
1947361d30c296531116c7bf668eb4c6d1fc7bc176eabcb0a60afddc63c777e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 5468 bytes
font_01_sfnt_off00010570.bin
836bff23d0eb1b38b3760c088a149d92660577c3a0dc88742be6b369fac56e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10570 10500 bytes

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