Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde7ce3e679a769f…

MALICIOUS

PDF

78.9 KB Created: 2021-05-09 03:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54e74fd986fb3ac6141d674c33c06519 SHA-1: 80f2a8914f74f5d39bd3f1f1ccda83b1dc1ed948 SHA-256: bde7ce3e679a769fc110b90ded101d8bc68d1c284b08d632c619eb021c6a3460
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, identified as a PDF link farm, with several pointing to known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=yoga+asana+name+and+photo
    • https://cdn-cms.f-static.net/uploads/4366406/normal_601f53497474d.pdf
    • http://nejupike.mygamesonline.org/zuxulikegafijudazug.pdf
    • https://static.s123-cdn-static.com/uploads/4403418/normal_5fc7ffe5c7a22.pdf
    • https://static.s123-cdn-static.com/uploads/4500679/normal_6007439570c28.pdf
    • http://lamisorosasam.mywebcommunity.org/sugowezuwel.pdf
    • https://cdn-cms.f-static.net/uploads/4489599/normal_5fd32d175e553.pdf
    • http://fuzabura.sportsontheweb.net/zenolisazi.pdf
    • https://cdn-cms.f-static.net/uploads/4485296/normal_602ebe471fa1b.pdf
    • http://wigobike.sportsontheweb.net/conducting_and_semiconducting_materials.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_7578fe1440e14512a4aca6f2b4e2fe03.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a48c46c-aceb-459d-a499-b424320af94b/71302025511.pdf
    • https://uploads.strikinglycdn.com/files/dd39c5e6-5af6-4a43-9d5a-55e961144b05/lobozinopakirodiwajigew.pdf
    • https://uploads.strikinglycdn.com/files/fbfffc54-6a76-463b-a690-06f9bc52ca71/rudavogejimagetazok.pdf
    • https://uploads.strikinglycdn.com/files/6e49697d-4e12-4615-91eb-d5e45d868ad1/tagagojimuxezevota.pdf
    • https://uploads.strikinglycdn.com/files/38004472-8f4e-496e-a095-a4faa0eac855/biblia_bilingue_reina_valera_1960_letra_grande.pdf
    • https://e1dd9d5d-2564-403b-b9eb-750b563e155e.filesusr.com/ugd/00b056_611cc8fa24904111bef018ea9c9f2dc4.pdf?index=true
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_61b65bc9065e48c39fdb9aa029d9366a.pdf?index=true
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_ec4ccb82169d4bd49e10c20d81c34507.pdf?index=true
    • https://uploads.strikinglycdn.com/files/64968aa9-ea1d-464a-9caf-a09edc858f62/rupofatujozawux.pdf
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_2158c46106854352b2d1b69711270890.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9465dae0-7b5c-4133-8f47-f155ad6ad0d1/64826339237.pdf
    • http://luvetux.myartsonline.com/14827438038.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_off0000f8e1.bin
3555eefd6a6364af44578b2e84774bb40fa932ffbbb0566d597cd0bd256f6644		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 5204 bytes
font_01_sfnt_off00010a77.bin
55c2b0a7e4fcd364d1a1eb6f6ae3d9cf9911b36bf1d318549c0ff442022ea990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 10508 bytes

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