Malicious PDF — malware analysis report

Static analysis result for SHA-256 954e45a735a8cf31…

MALICIOUS

PDF

91.8 KB Created: 2021-09-12 21:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eac3602de96adc3a9e5f9d2c1d059a0c SHA-1: 917f009d1d69a46bb7ee3a9ba520f7fbcfdc3690 SHA-256: 954e45a735a8cf31ec32332fe14e0296fe25a1a7b605c29a580fe01a883b2bb5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://iqrainternationalschool.org/_assets/files/67237113629.pdf In PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/32581200914.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/jozizegixukowidelaxu.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631336601.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/51295237956ffe8e55ecb0f4d3460e6c/wavabakizako.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/49399167044.pdfIn PDF document text
    • https://foulardfotografando.it/file/94165642400.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/liwipiroru.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/pikomebiw.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/60110008470.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/godinapizaxorobulofevoba.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/76037308842.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/9304274900.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/zaxumosaxiw.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210910114957.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/207039893461317e91611dc.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/sefaxutanorizezenoropef.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/zafefik.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/femanutigupamufopux.pdfIn PDF document text
    • http://chapelguild.com/images/usr/wopepudejisumejex.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/pilukejezojasixowuzulopoz.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/77761034279.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/zexavigomexoruzuguwevulu.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/mewituxaxumuxifirefezaji.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/mutude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+5+cheats+xbox+one+unlimited+moneyPDF link annotation
    • 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_off0000ff56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 11164 bytes
SHA-256: 129b06a0e2b7323e300d706b2a6bca64e2ad6128e5a05c8ee105aac820bfd70e
font_01_sfnt_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 18796 bytes
SHA-256: 5e5a6b8c2bec79b89f77d3138e65258080ce11b2d76361d542b9c1494a1de2f3
font_02_sfnt_off0001498d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1