Malicious PDF — malware analysis report

Static analysis result for SHA-256 33125529c3ede25e…

MALICIOUS

PDF

76.8 KB Created: 2021-09-13 17:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89466b259844c65ff5fc4b3165ec23d9 SHA-1: 93165a905e47d09ea7d954fcbb664d8c23a21887 SHA-256: 33125529c3ede25ee761e2ab16948563dbf47314dab83093d29eafb1c364fe89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as link farms on disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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 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://huntic.ru/uplcv?utm_term=game+android+upin+ipin PDF link annotation
    • http://hoclaixebinhthuan.com/upload/contentFile/file/sanavutodikaja.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/kabimawonanikoduna.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/rigex.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210912150819.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/fidimumedipelumepovi.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/jotogizagimamojijotivi.pdfIn PDF document text
    • http://kant21.com/userData/board/file/41178574184.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/digetofelevidopeledowur.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tixifaje.pdfIn PDF document text
    • https://filetorme.com/upload/files/90274875945.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/77120263230.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/85750140535.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/falatujilev.pdfIn PDF document text
    • http://trovas.com/userimages/84793528057.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/mukotitotanabikod.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c065374963---rutigatiwimas.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/rajijadelofamifozosu.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/sajew.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/teposusuvetipagu.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/70041818075.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/mirakotemepofabibelu.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/26641648863.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56C 18452 bytes
SHA-256: af5ac6541527626276d00c837c1110ef7d5d89b501162adaccbd4998b69197b6
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 10380 bytes
SHA-256: 0c105818ff9aba51ba293f3d518d927f2fabf2ea0cee6a486df97e675cac4194
font_02_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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