Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fea5861b709de2…

MALICIOUS

PDF

60.9 KB Created: 2020-11-28 03:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8c2d24d14aba4232502f661569a46468 SHA-1: 106946104d1f16289c3b5b148264f62397c1a979 SHA-256: 20fea5861b709de223aa4e84811463dba521c2a961c16f04121f300a110e8a30
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=reading+a+bank+statement+worksheet+answers+6-3a PDF link annotation
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/fomonutol-xepaleden-bukav.pdfIn PDF document text
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/taxadifupesafutom.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/fijezil_lukadipu_foxusovur_lesorajaxi.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/425fa.pdfIn PDF document text
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/witivafetuderux.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/penefelomiju/toyota_automatic_transmission_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1da6f74-7812-4081-b8d6-6d56aee8e7f0/mapibiregobobizamegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab085ec-4c5d-4b65-8ed7-cad20da35c2e/gobegizif.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/49118619910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90cff84-a501-4554-85e3-c6bd37c0ec15/46831963265.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/lazemuvifosax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32357dad-4be2-4a9c-b18f-983a8703b33f/sadunevonemi.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/16963563894.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/stubhub_or_ticketmaster.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/kolajepej.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_off0000b213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB213 5860 bytes
SHA-256: 06da05f1540ffe0cb60f2630099ddd7cfe38376333771efd55a978c9b913e50f
font_01_sfnt_off0000c5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FF 9472 bytes
SHA-256: 4fb27f6b66de3e2aa350ed87fe177331f9993481b4178ea4950c35a4e7fd4eef

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