Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33c91a77f64cbbc…

MALICIOUS

PDF

82.1 KB Created: 2021-06-10 14:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4b7745d259329e2c349a819a96eeaa48 SHA-1: ce4887186533f530c959158e2ba0aa05f823cad5 SHA-256: c33c91a77f64cbbc8be3cc63825c014c733d11b682ef44c50aba771fdfa5ad9d
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery, often associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/pbw?utm_term=carrie+full+movie+free+online PDF link annotation
    • https://xinewufovina.weebly.com/uploads/1/3/4/2/134235071/pumefu-wuwadavakoxe-kexudogeture.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_603d2e2dd7d1c.pdfIn PDF document text
    • https://padilokemim.weebly.com/uploads/1/3/1/3/131381900/rarifige.pdfIn PDF document text
    • https://jurutidi.weebly.com/uploads/1/3/5/3/135397820/9488121.pdfIn PDF document text
    • https://vajawopi.weebly.com/uploads/1/3/4/5/134597817/8842fc766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_60521771214fd.pdfIn PDF document text
    • https://delaludesepomaz.weebly.com/uploads/1/3/4/0/134096679/rugafigozinop-sibimuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_601217a97108d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_605930a53d1fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491933/normal_6056e552c2a5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_603a1ca3cc840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481069/normal_606e6c26cc56d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502698/normal_6061bf3483638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422378/normal_605c977794308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473892/normal_605f56f6d8550.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://siruzosu.pbworks.com/w/file/fetch/144759228/74915576873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c761e99-074a-4c53-8405-c146c8677cd7/67386724460.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/f/samsung_ecobubble_7.5kg_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031b56d9-c118-45c3-9b26-04e363f9a64a/rapitest_soil_test_kit_results.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576a1751-070b-47e2-8e70-53d9e590cad9/11102474747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/364b2697-e472-44ca-84c6-5db2ae29682a/javevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d78282-0c03-4814-a747-5d5603798b83/acurite_pro_weather_center_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa74a481-1ea6-4a64-97fd-d9f3e0a48aac/bible_study_guide_for_beginners_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ce6421-606a-48db-b391-defb0ca1289b/32233502753.pdfIn PDF document text
    • http://tejipufiwuma.pbworks.com/f/miwetebulepe.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_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 4620 bytes
SHA-256: 72fa8c2a73da38289ef92a1dd229c2777e3f9cbdd605fefc9c0b0874c2189500
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 10916 bytes
SHA-256: d1e0f3047fdb91f2de28bb03c304ad84fb876bc51ed607aab6ab02b545e2a4a8
font_02_sfnt_off00012c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C35 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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