Malicious PDF — malware analysis report

Static analysis result for SHA-256 673a6c67f54afaf3…

MALICIOUS

PDF

75.8 KB Created: 2021-04-06 03:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0287e8c7073df5e0d618a3ab666d0c84 SHA-1: d7417d0275c6ee16693fd6cd46a78cfdda7028ff SHA-256: 673a6c67f54afaf385b169893722f3621eaa6b303ef05bf7cb47f8f80c85cee4
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/wix?keyword=farberware+electric+pressure+cooker+chicken+recipes PDF link annotation
    • https://dirarogevuku.weebly.com/uploads/1/3/5/3/135351224/liwizitimof_powazime.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/certainteed_landmark_shingles.pdfIn PDF document text
    • https://mewibanomerazam.weebly.com/uploads/1/3/5/3/135348120/547c534777.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/94757888266.pdfIn PDF document text
    • https://piwonixegejeni.weebly.com/uploads/1/3/4/4/134438846/8656822.pdfIn PDF document text
    • https://zegepefuloruwan.weebly.com/uploads/1/3/4/0/134012378/6860138.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/kezemiradigu/18483209597.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/edf_energies_nouvelles_sa_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/large_hadron_collider_guided_tour.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/48893808960.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/la_divina_comedia_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/gokowotixosakewevi.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/java_1._6_0_29.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/42274144975.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/jasoda_sarkar_baul_gaan.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/somagonedaxele.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/exemple_de_bordereau_d_envoi.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/vifajusosafadovar.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/manual_chrysler_caravan_2007.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_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 5272 bytes
SHA-256: 032dd5da852f934ad90639f28a0abe7de0e5fd5648d9d6418c0cb3ec7b762cb6
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 10604 bytes
SHA-256: be7920062c72c56af54256d9c6ca88c891c45bdafdd249c4a59a106adee9c3af

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