Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff1589d685a46b9…

MALICIOUS

PDF

73.1 KB Created: 2021-03-17 20:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 61d44773a1a02b6d4404d6f924287296 SHA-1: 7d069ad11d56ce73e51f22cac21a0d8da6ebab99 SHA-256: cff1589d685a46b9892535089e8474b995638bac8d777b9abe7563a900dfa042
186 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/wix?keyword=onan+bge+service+manual PDF link annotation
    • http://posadukik.getenjoyment.net/windows_shortcut_keys_for_display_settings.pdfIn PDF document text
    • https://cdn.sqhk.co/bopesajan/hdxYjcn/dynamic_cleaning_services_kondinin.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/livam.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/Ojhjihg/24593991006.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/manual_parlante_jbl_flip_5_garbarino.pdfIn PDF document text
    • https://cdn.sqhk.co/gezefesete/gmAjihd/anthill_farms_syrah_2016.pdfIn PDF document text
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/7f7c1bbc4877.pdfIn PDF document text
    • http://vutunema.mypressonline.com/how_to_unlock_disabled_iphone_without_computer_or_itunes.pdfIn PDF document text
    • https://cdn.sqhk.co/gojogefe/Tif2jjL/petebo.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/2696212534.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/aggjehi/photo_collage_blanket_walgreens.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/xhcjeha/b_52_bomber_crash_greenville_maine.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/hejbLFY/17919451985.pdfIn PDF document text
    • http://bulakirip.getenjoyment.net/fuvad.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/vamexunuburo.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/xwPifOH/54842623141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dbb6350-4ff5-4949-9eef-6029239f04e4/bijerikavipanowejumudin.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/employees_synonyms_and_antonyms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7adfa41d-3651-403d-bcae-ec8c3d439dc1/70992414223.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_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 5344 bytes
SHA-256: b81957f14a8c109341f61dfd256031693c3b76d2ad0b9611658cbf44021acb41
font_01_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 11164 bytes
SHA-256: 354011939f99b324ad17ea813ab6497d94f456b952e316c7b0e647b819ac7d60

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