Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b6828ced3f7e67…

MALICIOUS

PDF

67.6 KB Created: 2020-12-15 08:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3839ee0b315b19fefa0675c49ba4b374 SHA-1: baf3b3f225672d211d82978a69ce87860bb9d806 SHA-256: b3b6828ced3f7e676fd4876fcfa367d43f9c563233d99455134d02f208081e83
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm with numerous external URLs, one of which is suspicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam, given the context of 'elevation certificate cost'. Although no scripts were explicitly extracted, the PDF structure and external links point towards a malicious document designed to redirect users to potentially harmful 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://traffnew.ru/123?utm_term=elevation+certificate+cost+texas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f8f94083d7bc.pdfIn PDF document text
    • https://rogujodur.weebly.com/uploads/1/3/4/8/134899240/ximogofabiveg_dukozeponixuzat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f87582290299.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/9b764fd9a.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/59304c5b-4e14-4814-bffb-a2b69db606ba/star_trek_fleet_command_dilithium_farming.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/last_episode_girlfriends_guide_to_divorce.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/arvada_west_high_school_staff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9de574b9-baa7-4b90-b5ac-a214d9ff0c1e/35437679919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b67fe4-4a27-408d-b595-9a219560b1ec/descargar_sony_vegas_pro_13_gratis_en_mega.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/sakexowezukupep.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/the_losers_2011_full_movie_free.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_off0000cdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 4960 bytes
SHA-256: 3e2abedb168bc697901bc9319f4c7a5404c29ead6016804cb37351f3b95c619d
font_01_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 10316 bytes
SHA-256: e31406d6b31adab26e2ebc25aec958d91841773dc1a825df3fcef2744dbbe525

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