Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c934dc0e290225…

MALICIOUS

PDF

82.2 KB Created: 2021-03-11 04:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 572bf717f0f8aaeea228d1d5d886b184 SHA-1: a2947fc1ec67842733430489a4045445f199dc96 SHA-256: 77c934dc0e2902252822a422b5cf4eb946f2cf4a62df8f36a2dbe1a3832b369b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for hosting phishing pages or malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically identifies this pattern, indicating a malicious intent to redirect users. While no scripts were extracted, the ML classifier and ClamAV detection strongly suggest malicious content within the PDF structure.

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 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://leonvi.ru/award?keyword=area+of+composite+figures+activity+pdf PDF link annotation
    • http://supernefritroller.xyz/apology_letter_template_for_behaviour1hw1o.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/64242544477h7i84.pdfIn PDF document text
    • http://tgesheff.xyz/pubemuwunadivocgmc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530457/normal_5fea1a58ea2d4.pdfIn PDF document text
    • http://damvglaz1.xyz/58243069960bxvfu.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/carnatic_music_books_in_tamil.pdfIn PDF document text
    • http://ses-paypal.com/sasupetamovedabizap264u.pdfIn PDF document text
    • http://7lessons.space/anton_calculusuq9mi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5fdfcac483436.pdfIn PDF document text
    • http://jidogirikar.mygamesonline.org/julius_caesar_by_william_shakespeare_analysis.pdfIn PDF document text
    • http://discount50.pro/tree_of_life_tattoo_forearmbc6f8.pdfIn PDF document text
    • http://good-production20.site/takutofofidinaxejukmxefc.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/como_rechazar_una_propuesta_de_trabajo.pdfIn PDF document text
    • http://hookup756.fun/xokowobalopipazadud3rnye.pdfIn PDF document text
    • http://kawlites.online/bofixafugebosarx72sz.pdfIn PDF document text
    • http://buvalopexur.mygamesonline.org/what_is_concentration_in_geography.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/mecanismo_de_accion_de_los_aines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gubadif.myartsonline.com/53488232709.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/a_first_course_in_differential_equations_11th_edition_by_dennis_zill.pdfIn PDF document text
    • http://najexenij.onlinewebshop.net/kilofavivinuzopuwipamezir.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_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 5592 bytes
SHA-256: 536937c3a084883089acf4f4589224f311adf5f49f3dab640745f124b8049518
font_01_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 10812 bytes
SHA-256: 032e7cc6b51e9454f1ca15f30cb218a0892c406960839e8ec8c4fb2a69a1f670

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