Malicious PDF — malware analysis report

Static analysis result for SHA-256 683f2ee7c565d5a8…

MALICIOUS

PDF

75.6 KB Created: 2021-04-03 14:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2c5eab824b40d55437d60efc480c3b31 SHA-1: b2689b8eecc1ee7f4a0b7edd786db90801c0792f SHA-256: 683f2ee7c565d5a859459f5ec24959602c773a6f47f2e691dc0fdbd210ae4adc
186 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 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/award?keyword=entrepreneurship+pdf+notes+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485703/normal_603170438323a.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/thyroid_storm_an_updated_review.pdfIn PDF document text
    • http://vakiduweg.mygamesonline.org/badizorimawufemuworije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_6057ac4eb90ac.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/proving_trig_identities_exam_solutions.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/bald_s_leechbook_download.pdfIn PDF document text
    • http://sizinepizot.scienceontheweb.net/rovijujorokike.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/14b22461-4132-475a-844e-bdd37d9e4ed4/90093596696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a01fac-db40-4475-83ac-4dd835255ffe/xatexom.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_327f6da77a1548d188e7c17116022390.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4da82787-3a5a-4ce1-9854-c748008819c8/how_hard_is_shrm_certification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d611a0c-d15b-401e-9bc4-c6c6f2ce28e2/ralabifesir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8933d5c8-4b0a-41f0-97d4-fae728c719e2/diablo_2_the_awakening.pdfIn PDF document text
    • http://miwewugewu.atwebpages.com/15800385283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11530da6-0980-4c13-af7e-d7dc0a94cad7/29153683736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c15e98-3b1e-4761-9520-44a00658564d/lulizirivopewasinosun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c0f161-2514-4ec5-8941-2a650c5d3756/66385620662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/294c8a41-817f-4b58-a0a5-72c83db325fd/2097201813.pdfIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_0526068fafad468e9b0b1e454ad44208.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1ae176-67ea-4a54-9708-fd3731545912/73465413527.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_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 5176 bytes
SHA-256: 5dd4dcd56fd0ff67ec7cd5a8aedbf9c3121a87cb79e64bfdf6306535266ee98b
font_01_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 10352 bytes
SHA-256: 6c9d6f416791bb82e04e17843475ee6820eb357dd032cc31ba86e3decf5fc708

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