Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8dc62f0475293b…

MALICIOUS

PDF

74.7 KB Created: 2020-12-24 16:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 41e19bf96074f2a1e689cbf1b1618cf9 SHA-1: 84ce0cefc695e5c70e1d8b582e007b3bf2bdee4a SHA-256: 6c8dc62f0475293bd192ff39a62e5ec76d358496ab094c72b9d3545ac00830ae
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=racing+blue+storm+equus PDF link annotation
    • https://kujivorel.weebly.com/uploads/1/3/0/7/130776875/waxim_bijevetojilis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5f990a8d73f93.pdfIn PDF document text
    • https://guvapokasek.weebly.com/uploads/1/3/4/4/134437462/5409424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5fb3f301e36ab.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/pefuguxobarulegome.pdfIn PDF document text
    • https://cdn.sqhk.co/pekebugus/Phd2Egj/bethesda_prayer_hall.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gonima/66170634084.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/72135076881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53cc740-4ed0-453c-a7ab-58e2a987f2bf/boletadogi.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/4_bit_full_adder_logic_circuit.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/zaxefaluvulipurazebi.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/textos_argumentativos_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8fec14b-3fc3-4fa7-9c11-9f186123b90f/28379668849.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_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 5392 bytes
SHA-256: 8ed49c6777928d65155f76f2178972cdbbac3948b6d29c4d589798b330fae4da
font_01_sfnt_off0000f538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF538 11720 bytes
SHA-256: 32147d57eb7a857c80ca556de71232938dc5ccfaa1ae89a60628c35b99f793b1

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