Malicious PDF — malware analysis report

Static analysis result for SHA-256 6970a9b429c31bac…

MALICIOUS

PDF

72.0 KB Created: 2020-12-26 17:35:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a227b779893f35955045b58e6396871f SHA-1: d59a3e58b94711f2ccf727d53590327fd33fca60 SHA-256: 6970a9b429c31bace30887b1aad7018eee64a51a04ada2faf68bf50117d8e433
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one specifically pointing to a flight search query. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to create a link farm for SEO manipulation or to direct users to malicious sites.

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://trafffi.ru/123?utm_term=boston+to+cleveland+ohio+flights PDF link annotation
    • https://kekuzisalan.weebly.com/uploads/1/3/0/8/130813403/6987228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_5fa4d65746af6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5fbbb811128c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/14562f80-8780-4bd3-81df-a8d2eae5bc3e/hot_air_rework_station_vs_soldering_iron.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187b0801-9160-4d5e-b8ae-b88cf1ad22d9/40134097227.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/zivut.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/cricket_bowling_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/definition_of_contemporary_american_society.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a99083-2896-4a28-b633-8ca92d39008c/real_debrid_apk_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/nike_lunarglide_womens.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/kejodikuze.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/chenab_college_jhang_uniform.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2F 5084 bytes
SHA-256: 5e0a7cebe030d00b63ed6271be95564685a570bec794c721ebf05854c82b9bc2
font_01_sfnt_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 10760 bytes
SHA-256: 94ef994927d1c7dc3de8e426e459476219a1d676d74c4c224f30bae4b93f9e14
font_02_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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