Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e555ddc94652d1e…

MALICIOUS

PDF

71.3 KB Created: 2021-04-01 22:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8afc48d32f6b9727c09e8f554a9121e4 SHA-1: 13eb1916a7d8693a1f92d2f0e052add93b80556f SHA-256: 6e555ddc94652d1e9674f986662f68deb67a2e981d4924a7af8aeec8da50a165
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a known malicious redirector. The document also functions as a link farm hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. While no scripts were directly extracted, the ML classifier and redirector heuristics strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=besa+brodski+dnevnik+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_604cb8cf574af.pdfIn PDF document text
    • http://femetorisufi.sportsontheweb.net/takipixidizuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420765/normal_600e7af20c14f.pdfIn PDF document text
    • https://nituxokijawagez.weebly.com/uploads/1/3/0/9/130969825/kuwotejudibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462694/normal_6000be4d31006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_605327a62ea3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_60005be3a4fae.pdfIn PDF document text
    • http://chempion.coffee/what_is_the_best_water_softener_ukvseu2.pdfIn PDF document text
    • https://mexukisigugat.weebly.com/uploads/1/3/4/7/134702857/fa7ab1d06b05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_60545e7fa0602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420930/normal_6003decc8fad0.pdfIn PDF document text
    • http://kupimaxi.sportsontheweb.net/9248781968.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/ruzuk_xabirifupevi_zisorimejat_salagulu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412889/normal_60450099f28c0.pdfIn PDF document text
    • http://demask.fun/extra_attic_self_storage_tryon_rd_raleigh_ncdeyvp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_6014a4d0d0e1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485016/normal_5ff0cd0ea061b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_605f49137a1d0.pdfIn PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/35df26f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453117/normal_600968bdbd206.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/agbaje_omo_onile_part_37zyiv.pdfIn PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/powikafejelazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zeteximezoxa.myartsonline.com/niluzanim.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/40729711993.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/deled_assignment_cover_page.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_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 5316 bytes
SHA-256: 1b39dbdac0dff5bd2413f12b9a039499e27394349fda10c72731cec41b5216be
font_01_sfnt_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 12104 bytes
SHA-256: ce2247355507c615ea02575f34bd6299357828758a858957262077c8b6771e1c