Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c32a83c1a82e639…

MALICIOUS

PDF

83.2 KB Created: 2021-04-14 14:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df221e49076f8590d38452892943baf9 SHA-1: 82f3c1ca828a6eb4948fc4e206a162a5ab268943 SHA-256: 4c32a83c1a82e6391f64bc82f0103afe993a4f182f490f5c91a5b7c9d032f5bb
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or spam distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/strik?utm_term=taco+bell+cantina+bowl+no+rice+nutrition+facts
    • https://duxataravur.weebly.com/uploads/1/3/4/0/134017775/ranisuzobib.pdf
    • https://wipowolulufobud.weebly.com/uploads/1/3/1/4/131437369/466711.pdf
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/mogexipagu_zerufub_nijilap.pdf
    • https://cdn-cms.f-static.net/uploads/4378155/normal_6010594b2e5bf.pdf
    • https://static.s123-cdn-static.com/uploads/4447662/normal_5fee0b9be088b.pdf
    • https://static.s123-cdn-static.com/uploads/4374372/normal_6008363240211.pdf
    • http://moxegelubopidi.sportsontheweb.net/totaxon.pdf
    • https://vitekasawo.weebly.com/uploads/1/3/4/4/134456264/377809.pdf
    • https://cdn-cms.f-static.net/uploads/4445130/normal_600fc17e7b893.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bowegasobufur.myartsonline.com/30637690820.pdf
    • https://uploads.strikinglycdn.com/files/70f4cc6e-c264-4d26-84d6-08b8b260b1aa/kisesinokekuzeg.pdf
    • https://uploads.strikinglycdn.com/files/ab69431e-8a25-45d9-95fd-73d22e5debe1/tirukapowadedusemu.pdf
    • https://uploads.strikinglycdn.com/files/6cbd492e-60c2-428d-ae14-1243c7fac722/sub_zero_fridge_freezers_uk_prices.pdf
    • http://fuguzametekobo.myartsonline.com/accounting_principles_definition.pdf
    • https://d6a293f2-6876-493d-91b7-c13182b05023.filesusr.com/ugd/bcaa7e_16b1acec8b83474b8ba0017e7b71b79e.pdf?index=true
    • https://bed2d873-735b-46bb-a8a3-264d0455df4e.filesusr.com/ugd/03ede2_ab4df2dae2c94664b9f63ec8c25e2bff.pdf?index=true
    • https://20e8ec16-a7ca-487e-906f-4b2d5c2744e2.filesusr.com/ugd/ab81b8_9ac76b5d61e9493b8aa3ab9d566f38ea.pdf?index=true
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_b86eee572aa34411bfc28442dacd0b9b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/903c0fcc-74f7-4cb7-a068-4eb7154b9fca/32431021406.pdf
    • http://zisukuvi.atwebpages.com/business_environment.pdf
    • https://uploads.strikinglycdn.com/files/6614e2f3-9a2c-4dce-aae4-0a3b13d330c1/troy_bilt_edger_tb554_wont_start.pdf
    • https://uploads.strikinglycdn.com/files/e1ba41a0-0b9c-451a-89da-d95a6311ab13/vakaguxiriwevuzujulej.pdf
    • http://pavabiza.atwebpages.com/railway_ticket_reservation_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa52.bin
81144cb5c0ebf6d83f49ffed03ec0dd8a7c747740509e8906895886249225e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 4936 bytes
font_01_sfnt_off00010b37.bin
4080790178e3290c89ffdc58a6dfc0c9099710e7c557f9887cad4ae12233b124		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 10960 bytes
font_02_sfnt_off000130e2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E2 4324 bytes

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