Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd1e83e70056623…

MALICIOUS

PDF

77.6 KB Created: 2021-05-12 16:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e11f3757fbe625372bc438d5f9b9587 SHA-1: d0397e206d18fad64dbf78a1025001c4a2522cc0 SHA-256: 8fd1e83e700566231b44b13e0e8f75d3fc3a11082f9d1caae439ca8a537491f7
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to programming a Comcast remote to an Onkyo receiver, which is highly suspicious given the file's malicious verdict and the presence of an external URI pointing to 'jacksth.ru'. This URL is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=how+to+program+comcast+remote+to+onkyo+receiver
    • http://nefozufovi.scienceontheweb.net/aristotle_and_dante_discover.pdf
    • http://doruguduku.iblogger.org/introduction_to_sociology_of_law.pdf
    • http://morasuxod.getenjoyment.net/laputa_castle_in_the_sky_piano_sheet.pdf
    • http://rabiwitijif.medianewsonline.com/marebadexat.pdf
    • http://dipenoguzel.sportsontheweb.net/mta_subway_map_download.pdf
    • http://xirijapip.mypressonline.com/36757340835.pdf
    • http://mowefopovog.mywebcommunity.org/gebagumefonuteroxefip.pdf
    • http://futajef.medianewsonline.com/how_do_i_find_my_tv_code_for_youtube.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d724aeb6-92eb-4881-8c93-6f08a3f85b3b/el_reino_de_este_mundo_prologo.pdf
    • https://s3.amazonaws.com/zomuzigo/jenoptik_ag_annual_report.pdf
    • http://tifusorozuja.rf.gd/1980_john_deere_410_backhoe_specs.pdf
    • https://s3.amazonaws.com/jidosatikim/zawodonetijegaliwaxiz.pdf
    • https://uploads.strikinglycdn.com/files/ca76f82e-a84c-4250-a93f-4a5ddfbb84d6/how_to_change_battery_in_honeywell_thermostat_th4110d1007.pdf
    • https://uploads.strikinglycdn.com/files/bb9ed682-19c4-45a4-9e06-6d79cf5677e6/how_to_evaluate_f1_on_a_graph.pdf
    • https://uploads.strikinglycdn.com/files/f7d46caa-3d23-4880-bac2-28ad177afe34/2005_nissan_murano_leather_seats_for_sale.pdf
    • http://nuzubiwow.epizy.com/70737882617.pdf
    • https://uploads.strikinglycdn.com/files/5b0fc377-6863-4235-bda7-4e471a3480bc/maxupejufutavesifimid.pdf
    • https://s3.amazonaws.com/fedufiporara/xamivusajiponupadog.pdf
    • http://zuxokoberibaw.atwebpages.com/antonyms_words.pdf
    • https://uploads.strikinglycdn.com/files/1650a955-4c98-4908-b716-5ddb26dc67f3/battletech_alpha_strike_quick_reference.pdf
    • https://uploads.strikinglycdn.com/files/45fa0202-f19b-4309-b4d7-1fc4af0c8744/53926485610.pdf
    • https://uploads.strikinglycdn.com/files/cb26cf43-a3d4-479d-a7ed-1a24c97e89c3/brother_printer_hl_3170cdw_troubleshooting.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_off0000f194.bin
04e9d3ee5b7ede7e10155b1efb380e5e859c5ddb0b1fe67f29b4f49f925e17b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 5500 bytes
font_01_sfnt_off00010457.bin
ed8874b8cf0b0ea35219bd3425c85e5018a98968aa50d0d5904519fbe5538d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 10588 bytes

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