Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd073a3d92cffa34…

MALICIOUS

PDF

85.2 KB Created: 2021-03-24 17:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 831417333de047e210efa17717665f73 SHA-1: 746d7636e1fcdb13cb468c72ddfef73106020b9a SHA-256: bd073a3d92cffa348de46eda16f0b7738291e9991fac0b7cf705d5de00224614
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://zajinet.ru/strik?utm_term=2003+jeep+liberty+sport+reviews', is likely the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=2003+jeep+liberty+sport+reviews
    • http://latitekiwa.scienceontheweb.net/53072614550.pdf
    • http://bu-markett.com/python_strategy_pattern_runtimehk0up.pdf
    • https://movimuwetimegi.weebly.com/uploads/1/3/4/3/134342740/nawobinibe.pdf
    • https://zukaxopukij.weebly.com/uploads/1/3/1/1/131164552/262174.pdf
    • https://guroposuz.weebly.com/uploads/1/3/4/4/134469393/2838022.pdf
    • http://rijebipimaba.getenjoyment.net/last_christmas_piano_sheet_music_free.pdf
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/zenuzaza_pajop_japofuvafomif_xidoru.pdf
    • http://amandeepsadyora.com/87073837836s7x4w.pdf
    • http://roboludawu.mywebcommunity.org/how_to_connect_logitech_wireless_keyboard_to_firestick.pdf
    • http://lnstagramverifiedbadgeshelpcenters.net/melian_dialogue_meaning_in_urdu0nub0.pdf
    • http://valuburikodajad.medianewsonline.com/why_is_my_babys_sleep_disturbed.pdf
    • http://usacreditreport.info/waxipemezozajepakusisavopk42k.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_12b8fe94fc60478ebea54b266bf7a806.pdf?index=true
    • https://s3.amazonaws.com/pisik/akkad_bakkad_bambe_bo_song_free.pdf
    • https://uploads.strikinglycdn.com/files/f268ac28-73d4-49a7-a970-e34029917718/how_to_connect_brother_hl-l2350dw_printer_to_wifi_mac.pdf
    • https://uploads.strikinglycdn.com/files/683732d1-a4f2-43c1-80cf-7882f1dec98a/hayward_power_flo_matrix_pump_manual.pdf
    • https://uploads.strikinglycdn.com/files/96844d42-8b39-42b0-a707-b9e261f81d61/58348329678.pdf
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_8f2b68d41ec1461c8dd9378102859b8e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a77bad5d-9918-4339-a29f-d7e91aa05b52/7472299834.pdf
    • https://s3.amazonaws.com/ruzumeb/14427752527.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_off00010e3a.bin
370afce8c681b2e2decaaf331ba783d40df8d7046fbcb74803a3ab374df9db81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 5416 bytes
font_01_sfnt_off000120d3.bin
18ad6eb732ca6e303e29da9dafe3513647307142388900e52fb6983dd9004d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 10936 bytes

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