Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c6e4d1ff10c18f…

MALICIOUS

PDF

80.1 KB Created: 2021-05-29 02:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6b2935a360fae76a4371883d2460571e SHA-1: 2b90026daafb7ad9f4b1ff04e41ea9624b2d52c3 SHA-256: b0c6e4d1ff10c18f4b643e8e02ea4c3f0232eb8235b9e4117c3d94fe04727715
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of the primary external links is to 'gimoguvi.ru/strik', which is suspicious. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojanized document. The presence of embedded URLs and the ML classifier's high confidence score further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://gimoguvi.ru/strik?utm_term=motor+learning+principles+and+the+superiority+of+whole+training+in+volleyball PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411273/normal_60011b2b1fc85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401971/normal_60248ab74e794.pdfIn PDF document text
    • https://xatawozenovug.weebly.com/uploads/1/3/4/8/134886035/3938109.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473052/normal_5fce8c1656ed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405641/normal_606ddeeaba63f.pdfIn PDF document text
    • https://barezixajeg.weebly.com/uploads/1/3/4/3/134318527/3851762.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_5fdce2b06c826.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408343/normal_60b0041726355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_6021bda8541b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_604e7a8005568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469119/normal_60019dbbd7140.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdc6ad4-7e94-4b7a-8e7e-4b5a67dde739/27182334574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531c3c41-630d-4dd1-8eb0-ed986c8b4aae/witcher_3_blood_and_wine_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b4b3838-3b5b-418f-bf31-56d80f77f8a4/lolovozutixabuganimawiram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bf25c2e-0804-4b15-888b-e9c204648496/is_glass_rated_rock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05983beb-65df-456f-a3fe-374aff56f900/4388940008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d39cc60-ce21-454d-ab64-0475c22c2c29/25122297266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4e5cc9-182e-447e-9041-3052dca1cfb9/xedokajubulebaselo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff304187-5669-4222-99e0-146b78c03ff8/dress_down_day_at_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3106b061-3bc8-4c0f-81f4-f4b1991be72f/how_long_does_priority_mail_take_to_deliver_internationally.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_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 5816 bytes
SHA-256: 964e120c172549aef91743124a40c2ce9b4cfc67e82069de1e8d9f26de92ddf4
font_01_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 11100 bytes
SHA-256: f8b256a00b5bf3d4cba376d91b2ab93d05df627814661a4c6268f4d58915d7a4

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