Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad58fb8fa8793ae4…

MALICIOUS

PDF

72.8 KB Created: 2021-05-12 09:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2b679f2c114b9bdd5c0abdaa493c8245 SHA-1: e794f816ace8af3c63b0a841c8e9e672e9a71513 SHA-256: ad58fb8fa8793ae465cdab9a87763eac6216b32e5972d123f23fce42972b8cac
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to a download, reinforcing the lure aspect. The presence of external URIs and the link farm heuristic strongly suggest this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/strik?utm_term=manual+j+residential+load+calculation+8th+edition+full+free+download PDF link annotation
    • http://duxinivodozular.mywebcommunity.org/scales_chords_and_arpeggios_for_piano.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/vukapevivagesevuvixiniza.pdfIn PDF document text
    • http://lifegirls.site/xijubasorhfsj3.pdfIn PDF document text
    • http://libertinemodels.com/441401385751x976.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/billie_jean_tab.pdfIn PDF document text
    • https://cdn.sqhk.co/filovixedalu/iNEifgj/zalos.pdfIn PDF document text
    • http://world-wildshop.com/jalele8q59.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/Wc9hcXu/minecraft_servers_pe.pdfIn PDF document text
    • http://italy50wow.pro/801567567466j9w2.pdfIn PDF document text
    • http://marketeuro.pro/proform_tour_de_france_tdf_cbc_indoor_exercise_bike_reviewqjh08.pdfIn PDF document text
    • http://vostokzapad.su/21166489128ifz4a.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/ijTibji/best_rock_climbing_hammer_drills.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/Sjdicjb/wenabumasudifexirewova.pdfIn PDF document text
    • http://pitushok.space/hitchhikers_guide_to_the_galaxy_best_quoteso5wtn.pdfIn PDF document text
    • http://tk-pobeda.site/how_to_print_without_color_ink_epson_windows_109fbdy.pdfIn PDF document text
    • https://digikugububim.weebly.com/uploads/1/3/0/7/130774990/ccf5cbd3939.pdfIn PDF document text
    • https://vikurevago.weebly.com/uploads/1/3/1/6/131606257/39edfce.pdfIn PDF document text
    • http://mon-cmbretagne.com/40076413935y1juw.pdfIn PDF document text
    • https://kifewaremavej.weebly.com/uploads/1/3/1/6/131606874/9312ed3f6.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/85310582874.pdfIn PDF document text
    • http://subbellassecret.com/navpers_1306_92_special_programau8u2.pdfIn PDF document text
    • http://blltly.com/1mwvj2In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pofijiserige.onlinewebshop.net/17913007996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc49edc-4bfd-4ae5-a1ec-eaed1d6b8ebd/michigan_child_support_payment_coupon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d6a030-81d5-478b-a9f8-d54f8c441122/blheli_32_esc_setup.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 5476 bytes
SHA-256: 174a94a4eea3d3f21681ded4180193af51bcc4b4a1c4f2bef6809fea4348cac8
font_01_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 11084 bytes
SHA-256: 53db0d66dedd11a1a138f3f05ba2c734a330b6eb7b10ebdc6ac1323c96b494a4

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