Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5138d93aecff11…

MALICIOUS

PDF

65.6 KB Created: 2020-12-20 01:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8db6f83988b6666daa565fafca46dd8b SHA-1: 5939aadb55824d7f26d1a262705d242938341b16 SHA-256: 4a5138d93aecff11a3daf26aea2edfffb42fc78725d4417a511ad6a213497b35
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to 'trafftec.ru/strik', suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

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://trafftec.ru/strik?utm_term=how+the+irish+saved+civilization+pdf PDF link annotation
    • https://kelobutino.weebly.com/uploads/1/3/0/9/130969458/zegagoragek_nepumudusoku_woguxasar.pdfIn PDF document text
    • https://mepuzorow.weebly.com/uploads/1/3/4/5/134500467/nitamote-gasimorisajepi-lizirezuzusur.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/webipejonavuv/va_dmv_driver_license_renewal_fee.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc56310bf71053ccb2da539/t/5fce77908a454103bf760f06/1607366547283/1549435815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303ba35c-9f92-4a54-8030-56c288b96c09/mosquito_lake_state_park_weather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1299763b-ab3a-4a37-96f2-3473cb4ef65f/tirikokufuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5fda5d6-05ea-4443-b57f-d3bb6a80cd88/2008_bmw_328i_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/730847403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7146f729-c46b-494b-b85f-ef32ba52af72/18239838137.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/answer_for_heaven_season_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a665c09-9663-4d43-961c-abd22f26e79d/maytronics_dolphin_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa19826-d240-4aa9-8530-d666cd0a807e/divided_by_faith_summary.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_off0000c602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC602 5408 bytes
SHA-256: d39a608c8b77d1f87eb3122ab97474e5d2fb46a6a58ab44a11c46b1ecffeeb12
font_01_sfnt_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 9816 bytes
SHA-256: e69935ca09506d37b48f05f7d0d8a505ff1240aa16de3cdece3455d55f5ef11e

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