Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad78803efa81fdc…

MALICIOUS

PDF

66.0 KB Created: 2020-11-27 07:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 99e7e2b475d2eeba945d7d8704929ea1 SHA-1: 15cce61aa20136eb9acc14b5255f6ccaca78d9a6 SHA-256: 4ad78803efa81fdc84c893d9952ba563fb18612996dc51ffc6e4eefbf42ff07e
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary external links, https://trafficel.ru/strik?utm_term=snaptube+apk+ultima+version+2019+gratis, appears to be a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafficel.ru/strik?utm_term=snaptube+apk+ultima+version+2019+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411491/normal_5f95bbc09f65c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_5f9b3b03df41b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425917/normal_5f9ba7c165344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480750/normal_5fbdb928233a5.pdfIn PDF document text
    • https://menuvudojowakap.weebly.com/uploads/1/3/4/5/134594867/vojor.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/vefikikenud.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/7989682.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/8eeb67aa-040d-4b99-9a64-a17e65f5a6f2/mechanical_energy_problems_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6590b0fd-caf1-49a8-beb4-7a35d06eca94/41868721183.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/tovufobilixeref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62fe158b-81be-45d2-97d6-644ebf10f2ab/wufimagalani.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/72942996557.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_off0000c307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC307 5988 bytes
SHA-256: 278de757e4c869db4dc8f8ea3ef17e834989618987cda7e9402ac728f81f6d8a
font_01_sfnt_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 10580 bytes
SHA-256: 6d10b2f504172ee543e3d9d917b5f7ca2bd9e6b092bec8bb9eea9677bf603532

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