Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e6e6f9a6099681…

MALICIOUS

PDF

60.5 KB Created: 2020-11-24 03:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 556cbea938b783b0371d918457acc86b SHA-1: 31f0d3a7a059e76b3b33a5c9606f6a0366121a7a SHA-256: 53e6e6f9a6099681ed7ce63208f45dbd64b3b2470b8606c8e5edf05097793221
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 link farm. One of the primary external URIs, 'https://traffking.ru/strik?utm_term=elektronik+elemanlar+ve+devre+teorisi+pdf', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/strik?utm_term=elektronik+elemanlar+ve+devre+teorisi+pdf PDF link annotation
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/gevuzovegosavo_vowalopuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_5f8dd0d442496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5f9232bc8dfba.pdfIn PDF document text
    • https://lupexepiw.weebly.com/uploads/1/3/4/3/134318885/1dd3d4b0daf5fff.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/fonibinaraj/2015_honda_cr_v_review_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27cdac92-347d-4272-806b-f63406acc8a2/28230026325.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/matter_and_change_chemistry_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/71031477960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c34541-a7b8-4d96-ae2f-7476fd736238/jubezumotiv.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/blanching_of_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e460ec56-1324-4b2c-be6f-0795bb0cb687/rumedugosevexakiluwozu.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/ariens_lawn_tractor_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/cacl2_msds_sheet.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_off0000ad51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD51 5268 bytes
SHA-256: 94a3967a4a8271469d83f8906a0e1d0dfdb90f05c13362efa67e0869ba348b97
font_01_sfnt_off0000bf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2F 11540 bytes
SHA-256: 020a3cfd385ec63842fc0b999ae4a90a59683f33c2e8b0f9be14ce9d1da878aa

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