Malicious PDF — malware analysis report

Static analysis result for SHA-256 451f1a77503e7b3c…

MALICIOUS

PDF

89.3 KB Created: 2021-03-17 18:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a75f13fc176c4a886a55732adfe889a7 SHA-1: 2b03a99e756517613321032d6ecbb984e7795b49 SHA-256: 451f1a77503e7b3c639ba6a1afcb0f42a2da06f54a94470b58d5a780472a11a1
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL leading to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's content, though heavily obfuscated, appears to be a lure related to 'caste validity form for obc pdf' to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://soxebez.ru/award?keyword=caste+validity+form+for+obc+pdf
    • https://cdn-cms.f-static.net/uploads/4456728/normal_60507051384b7.pdf
    • http://ledozikatiresev.scienceontheweb.net/how_to_record_closing_entries_for_revenues_and_expenses.pdf
    • https://static.s123-cdn-static.com/uploads/4409421/normal_5febe921a840c.pdf
    • https://static.s123-cdn-static.com/uploads/4454679/normal_6007c61b82086.pdf
    • https://static.s123-cdn-static.com/uploads/4390052/normal_6005209c597d0.pdf
    • http://kugibut.22web.org/materi_pelajaran_akuntansi_dasar.pdf
    • http://nawitebexu.medianewsonline.com/nugomegaxazezas.pdf
    • http://pidawudimo.scienceontheweb.net/trasplante_de_celulas_madre_hematopoyeticas.pdf
    • https://static.s123-cdn-static.com/uploads/4465914/normal_60004bbb59973.pdf
    • http://lizoguxumugef.mywebcommunity.org/rotivudeduxubebob.pdf
    • http://durebivov.iblogger.org/short_summary_of_ulysses_poem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rudelazifizuvo/adobe_reader_linux_mint.pdf
    • http://kivozusemu.atwebpages.com/the_golden_song_season_3_ep_4.pdf
    • http://kojevarokor.rf.gd/how_long_does_a_dyson_dc58_battery_last.pdf
    • http://bitujiduruv.myartsonline.com/tutorial_for_python_beginners.pdf
    • https://s3.amazonaws.com/rimejiguvif/tunivikalugagexopo.pdf
    • https://s3.amazonaws.com/dejazuvorira/pebozaluwiwusezonowulori.pdf
    • http://gifetezese.rf.gd/sasural_genda_phool_serial_video_song.pdf
    • https://s3.amazonaws.com/xipavir/pigowokipenek.pdf
    • https://s3.amazonaws.com/vovabagubajegeb/7716638688.pdf
    • http://neluwomarar.epizy.com/61788692849.pdf
    • https://s3.amazonaws.com/voxulija/fudew.pdf
    • http://lumosaneja.onlinewebshop.net/78076826078.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/formal_charge_of_boron_in_bh3.pdf
    • https://s3.amazonaws.com/vonutavekip/que_es_la_anuria.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
    • 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_off00010966.bin
c5872aa039d1892844c59175325050f6a57f29c2cc0d8f77e69be67d199ac515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 5508 bytes
font_01_sfnt_off00011c12.bin
5d34d8ebed9136d45d1e76324001093892db9ed727f9955331ecaaf7499352c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 11052 bytes
font_02_sfnt_off00014233.bin
159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14233 16140 bytes

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