Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd79cfc7765d101…

MALICIOUS

PDF

66.8 KB Created: 2020-11-10 01:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: eadc6062f03f10c53b83456c42935653 SHA-1: ddb9f741837aa752cde357bffba4c28c0141c97e SHA-256: efd79cfc7765d101669c0052c0e215ddf6483623b8bd9ce396c6906379a2b0fa
216 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. It uses brand-impersonation credential phishing. 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 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/xedufubedug.pdf.
  • 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://traffset.ru/123?keyword=pokemon+go+spoofing+ban PDF link annotation
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/xedufubedug.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/7094518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5f96e66f51bd0.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/libeganot/pizemirazus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032fa674-4a0a-4d10-bd64-1d8b8a2839eb/ejercicios_resueltos_productividad_ecosistemas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024a4ff9-3d60-496c-b591-b2fb3584286f/waninaredifavenagos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd49350-87dc-4ece-80bd-fbb1f8db15b0/muzuwokipizemim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec49202-e7f6-468a-ba34-14fab05e7106/90054208237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f79f738-1556-4a8d-9293-70b9fc26b7ed/zozeluvidusibuvib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320dc740-b36d-4390-b8ce-f4f8c9986c1b/60293336934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b03f0c-7ff8-4a4a-95e6-e8c0b3054432/how_to_draw_toei_sonic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49cda86b-d5d6-4b09-9f8c-db02d2689be8/gitumikedebalorixoziraja.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/69819274972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e05e57-bfd7-4743-b97c-81b08832c2ab/fukisodirigikag.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_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 5300 bytes
SHA-256: 59a15a8031e3a1475e52b21479873cdc7cfde061d16f1f29aa10ceaca86367cd
font_01_sfnt_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 11108 bytes
SHA-256: 7ac48b46c1d90c6719490b28024320824d17547c93451cad44bca30e65e0065c

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