Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b311db7eeba100…

MALICIOUS

PDF

70.6 KB Created: 2021-02-15 01:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7e4c6b7f83fdc64a959adfdd7455d455 SHA-1: 17c00fced4e0819f9bcac6bb300114568fe422ee SHA-256: c3b311db7eeba100c37af21a818900f1ca429c21e5a8f0824e05b77f0da60e91
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to search queries, suggesting a lure.

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://maypoin.ru/wb?keyword=alligation%20and%20mixture%20questions%20pdf PDF link annotation
    • http://igcopyrightverify.com/xojikatetodenaputxdv9y.pdfIn PDF document text
    • http://tikovg.xyz/download_for_pc_windows_10_gamesl213b.pdfIn PDF document text
    • http://m-laskin.ru/25206227453yw6tx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5fecf75d591ad.pdfIn PDF document text
    • https://cdn.sqhk.co/biposuba/tPhcFor/sing_karaoke_bar.pdfIn PDF document text
    • http://good-production20.site/hotstar_vip_freepl8t8.pdfIn PDF document text
    • http://registrat.space/lunastra_field_guidej7nwa.pdfIn PDF document text
    • http://mantenancie.com/hess_law_examplesbukuz.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/dzHgiIH/santorini_board_game_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479454/normal_5ffccb9b8a1e0.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/YjaP3jh/36587159776.pdfIn PDF document text
    • http://goloszauniver.fun/mibulegibeg1jpwj.pdfIn PDF document text
    • http://teaitalis.space/95601414gblvt.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/jedadokuti/54558598454.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/60765714373.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/press_conference_agenda_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/kendo_ui_grid_template_if_else.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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 5544 bytes
SHA-256: 272d26cd3ba691851238d8ba734f5a1b10f4837956c9a4d08ef8dea8c544f559
font_01_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 10632 bytes
SHA-256: 8920cff2bc29ff4705ef03a358a08c134ffa015d4fa959103cfefddf9831e5dd

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