Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc33f6be5c720406…

MALICIOUS

PDF

91.5 KB Created: 2021-03-21 05:31:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9d7eb2c448ae152d5328349814a1c907 SHA-1: 6bfb2f9279374f29880e17329242a8e110e86198 SHA-256: fc33f6be5c720406c9cc418e32755703d38627327685d993fabfd3389cc8ea5d
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs, including one pointing to 'jacksth.ru'. The PDF structure and embedded links suggest a phishing attempt or a lure to download further malicious content. Although no scripts were explicitly extracted, the presence of external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://jacksth.ru/strik?utm_term=fighter+diet+cookbook+pdf PDF link annotation
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/bugavimekuwefivarep.pdfIn PDF document text
    • https://bemezonef.weebly.com/uploads/1/3/5/3/135389856/lezejelo.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/36134053625.pdfIn PDF document text
    • http://sotikipi.22web.org/tafuwoze.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/80790111573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6021f39a2e0c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494138/normal_60352bdb8e6c5.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/parimidubujutopofi.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/cuentos_2_edgar_allan_poe.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/51633059588.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/vezosetojivefepumuxidifuz.pdfIn PDF document text
    • http://tepafuvofes.iblogger.org/17459301825.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/wesepa.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/d1c5a684.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/argumentative_academic_writing.pdfIn PDF document text
    • http://ramifapufebi.scienceontheweb.net/anatomy_and_physiology_coloring_workbook_chapter_4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379718/normal_6004cf0aef945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369505/normal_5fe545a4003bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tujatubaniza.epizy.com/26753974252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95eeb1c8-acd5-412e-8539-982cd82bf319/88713063092.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/pabosajixubalib.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/76303735764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02088da3-ff35-494c-ab35-350d0d303318/more_relevant_than_ever_meaning.pdfIn PDF document text
    • http://godamelo.epizy.com/voxapanofik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d30b414-4cfa-44f6-90e7-286b440ebe44/66532410030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9552b7d-8735-4881-ab9a-5413d8e05802/human_resource_management_definition_by_edwin_flippo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 4840 bytes
SHA-256: 3f963e284ba830e44bb6523b604ee3f68c7239337dafff8242d7ac79508bc036
font_01_sfnt_off00012a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A89 11648 bytes
SHA-256: ec88b769d26861b3d4dce95e434c42c5177b565dcebc1731037eada36395ad8e
font_02_sfnt_off000151f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3