Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fb108474fdfa95…

MALICIOUS

PDF

80.3 KB Created: 2021-04-25 12:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abb57466490c9b28c263ff5c626e587f SHA-1: 792c0a6c4b128858566e372ba8ede04dc0362821 SHA-256: b2fb108474fdfa9528ebe5df4dfdcdeea833abc5596637e84c3d1f0b058aa094
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://xezojetit.ru/strik?utm_term=ancient+greece+olympics+facts+bbc+bitesize
    • http://bagadiwep.22web.org/canon_eos_4000d_user_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4409840/normal_60316ef0c45a8.pdf
    • https://cdn-cms.f-static.net/uploads/4413239/normal_6052ce31bd251.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4917fd78-dacd-41a8-858f-d473a9ecb245/kagaludotemepe.pdf
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_4a38646fc75b47e984df1c83b9c645f3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e47c9598-e06f-4444-bb01-f3983634b8e7/how_to_rig_for_flathead.pdf
    • https://uploads.strikinglycdn.com/files/9a2fd51f-c0f3-418f-b68b-81ab1c280ab1/what_does_a_law_student_need.pdf
    • http://gowamatul.epizy.com/wosipodizuxokedirofij.pdf
    • https://uploads.strikinglycdn.com/files/66b44a5a-6d01-4fda-a93a-d61f7f8c48ae/jaramefamofadoliresix.pdf
    • https://uploads.strikinglycdn.com/files/bd70a199-4dd5-4e26-a14b-ec1271e9902b/91407767807.pdf
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_e175c428979f4f5eac2ea568a2f501aa.pdf?index=true
    • http://rituruve.epizy.com/boletin_informativo_escolar_para_imprimir.pdf
    • https://uploads.strikinglycdn.com/files/ed5c6309-21d5-4b0b-ab11-ad98f8ceb89e/merofudizatitelevux.pdf
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_0e0c5ef9acd94c21b8a91358b39cf968.pdf?index=true
    • http://tovedutineve.rf.gd/22902951791.pdf
    • https://uploads.strikinglycdn.com/files/10ed1a81-cded-4d89-9f4a-8a1d87641bfb/laxojenituni.pdf
    • http://velumosak.epizy.com/kydex_motorola_radio_holster.pdf
    • https://uploads.strikinglycdn.com/files/72f4f055-886b-4a61-a57e-474c5adcaef5/99661446251.pdf
    • https://uploads.strikinglycdn.com/files/53409384-402f-4779-9014-2775b6960df4/when_backing_up_your_car_you_should_always_look_over_your_left_shoulder.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_off0000fbe6.bin
999b5c13647b48d8c78c1848d0a7ea73fffb4a2a5e35512dc41577624c98fb9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 5616 bytes
font_01_sfnt_off00010efe.bin
52d4df2c45319a0fdca00e143d62e50c710d8d50a8908c9efb02e86c174b7134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 10972 bytes

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