Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc6b7f06e1afc39…

MALICIOUS

PDF

77.4 KB Created: 2021-03-13 21:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ef0f2dbcb8e7ac1fc47d8b1fee8ec665 SHA-1: b3730d538a1d161f46a899b80a61a74c5c73770f SHA-256: bbc6b7f06e1afc396f19ca7a36f46e20ec14b212bd96a129fc03b8a8d4aca02b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' point towards a phishing or scam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/123?utm_term=gestor+de+archivos+para+android+sin+publicidad PDF link annotation
    • https://cdn.sqhk.co/luwokiseg/73jihdp/nuzikipi.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/RigTJhd/75172106770.pdfIn PDF document text
    • http://vuroxinizona.scienceontheweb.net/xamugal.pdfIn PDF document text
    • https://cdn.sqhk.co/goganededem/cKLtMji/gravity_blanket_amazon.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/magedupavonoduduzifidazep.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/hhjgCge/vasefudebopunijujevulele.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/business_secrets_from_the_bible_book_summary.pdfIn PDF document text
    • http://sovolox.getenjoyment.net/watogonapodarid.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/wings_of_fire_book_5_graphic_novel_cover.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/how_to_draw_manga_for_beginners_with_angieartmanga.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/85eab0a1-8cca-4dbb-959b-b4a527a82967/olympus_om_1_lens_compatibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5334422b-dfa1-419a-84e2-fd3f481efb58/bayliner_owners_club_classifieds.pdfIn PDF document text
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_acd3293efbe546ec98626e9ac8dcb67c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d84a9c4-aa68-4df9-8399-29a7b2fb3906/bivifuwema.pdfIn PDF document text
    • http://mawokale.myartsonline.com/feeling_faces_coloring_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/610a87e9-b83c-4840-b94a-a6093731b2a8/48134489195.pdfIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_c17bc5343c5c464c86a2ebb140825da1.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_1487a9cd7014466d98d83452a6aebc64.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_9c283786209e4338aff41bfbe0d14590.pdf?index=trueIn PDF document text
    • http://zaduzos.myartsonline.com/jaxegogovi.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_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 5392 bytes
SHA-256: 82cd79d28234ede659e4ee63dc82050c78db68c5f8de8d347899ab9351ac7955
font_01_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 11188 bytes
SHA-256: 8a65c4c0100a92ccaaf98a766aa3049036fbcf4118cc9e9344f8537e07029772