Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd1fa6fd85a01a7…

MALICIOUS

PDF

73.0 KB Created: 2020-11-13 09:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4950fb7095c939d696407c9937387cbb SHA-1: bad509f86e2d9f21eb824b5a88d1ddae48c2d5f7 SHA-256: efd1fa6fd85a01a741eb250087860c6b0f0eb35a97294d7dc07dc91cdbe8d7d3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many of which are to PDF files hosted on strikinglycdn.com and weebly.com, suggesting a link farm or SEO manipulation tactic. The ML classifier also returned a high confidence score for maliciousness. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=reliable+vs+unreliable+sources+worksheet PDF link annotation
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/5986851.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7904132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_5faba348ed9b8.pdfIn PDF document text
    • https://mesedegusi.weebly.com/uploads/1/3/4/6/134600151/6864613.pdfIn PDF document text
    • https://bevatisaxotel.weebly.com/uploads/1/3/4/3/134378436/sejemerasowajavidon.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/9387811b-b9e7-4572-bd0e-d3433efdc701/82334715684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2194925e-6d00-492c-b845-3fc7c70f37ff/tigodibumikarib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171b1832-ec61-4e94-a392-1c0d1c387e81/81226006650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/265080d3-eb27-4203-8e85-b710c417bb90/farmville_2_cheats_trainer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb4afd7-0e73-4404-bc5f-f974714b64f3/92375267393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41daeef6-c946-44c6-87dc-a98b45b47d5e/chapter_24_world_war_looms_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb11524e-ada0-4456-9ad2-9dfd8ea842e4/kinugaxemovikodi.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_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 5252 bytes
SHA-256: 8ce8027cdeb1830756144c472b51253b58815c9e0bd70570ee7cdb38f33c7be6
font_01_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 11108 bytes
SHA-256: 1608280e327cde4f1537f278a900b233f552f5e1e380f602d9fe829c0c796b7f

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