Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f46b4c739dbb933…

MALICIOUS

PDF

74.0 KB Created: 2021-03-03 15:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 11a4c82fa98c6041399a75598367308e SHA-1: 5c687b6cda0992fecd6e65d85667750051ed3e20 SHA-256: 6f46b4c739dbb933da2388ea69d61da520f550ce73fc45a5027467c0e5ad3cdc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'number theory definition' to mask the malicious redirection.

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://xajibur.ru/award?keyword=number+theory+definition PDF link annotation
    • http://mopexaxurip.getenjoyment.net/supenoparebudolopubezo.pdfIn PDF document text
    • http://fringigejy.site/books_of_the_bible_list_printablekl6qi.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/0ii2o8i/highway_patrol_song_red_simpson.pdfIn PDF document text
    • http://domainlimax.xyz/platform_movie_full_hd_song0ny8t.pdfIn PDF document text
    • http://gonisavuxur.iblogger.org/rarusaxivisom.pdfIn PDF document text
    • http://tamakar.xyz/mefegukolupitigobw6zp0.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/eKjigfl/ultimate_general_civil_war_chancellorsville_csa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5fd0940ae03f8.pdfIn PDF document text
    • http://thelait.pro/college_prep_algebra_2e_workbook_answersdekcw.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/4wsieii/european_rowing_championships_2020_results.pdfIn PDF document text
    • http://pop-marketplace.ru/53412737111h43u0.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/ughgi6t/football_championship_trophy_cheap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zadumurimigi.epizy.com/82075777812.pdfIn PDF document text
    • http://sogoxutagejuno.atwebpages.com/la_plaza_del_diamante_serie_reparto.pdfIn PDF document text
    • http://xuvezes.epizy.com/84361943855.pdfIn PDF document text
    • http://fulovefodib.epizy.com/fizz_aram_build_guide.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/89793893741.pdfIn PDF document text
    • http://vekemelegewimo.atwebpages.com/what_is_an_information_sheet.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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 4936 bytes
SHA-256: d6761b697e0c85b81ad1c67455733ff15372898eef36f7bc61a6b408e8dd4e3a
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 10104 bytes
SHA-256: ea7c6e9ec4f39c55281356f66532f9ff9279437e53043c6f23012ca8f48bf834

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