Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c42c89515784b0b…

MALICIOUS

PDF

67.3 KB Created: 2020-11-23 17:15:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a0746de27d02db587705a454274d8a5b SHA-1: 17ebf8874c53f0e892dab1e2f4d24d21afb40c8a SHA-256: 8c42c89515784b0b33ad18e8bc247d68ca8edb7644829ddae9e7a3ff38fdfb9f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One prominent URL, 'https://trafficel.ru/123?utm_term=bridges+in+mathematics+grade+3+answer+key+pdf', suggests a lure related to educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely 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/123?utm_term=bridges+in+mathematics+grade+3+answer+key+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374359/normal_5f9b769f4ff3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_5fb85e356f975.pdfIn PDF document text
    • https://bikiwilusi.weebly.com/uploads/1/3/4/5/134512037/7343351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5fa15163a02bc.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/40f8b818-9a1e-41f7-aad2-6bb678b92750/zusigilovazezomunudag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/571a9772-a968-43b6-8dbc-0e1535d79e1a/9_day_novena_for_the_dead_catholic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1794f0a9-3079-4eea-98af-f9632a5407cf/lobokogoxefosusiwatesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d99edf8f-f974-4841-bf5c-90a88f50bb31/95776321859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7dab37-0197-4706-a79a-dfcf645aebca/84090306676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/872ad8d5-ff8e-4422-96b2-2c312360164f/49090950398.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/hair_and_beauty_salon_business_plan_template.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_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 6008 bytes
SHA-256: 80b4cd8151319e3046a5b0db520987a693580ae2632ae36cf674ca6bfd167b4f
font_01_sfnt_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 10736 bytes
SHA-256: 4989fd7c613015f0a71bdddadab4c726251015728d188ad64e481e6a9c0c5c63

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