Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39f70b22ff4b500…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 19:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f3c012c34a47c73d96ae8e19ba0c89b3 SHA-1: 82df9098ececbb759ad453309e3c5485e5fc3eeb SHA-256: d39f70b22ff4b50086e8cd4e5b705fb785e16a6d4095c715914574257e496597
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://infrive.ru/uplcv?utm_term=android+new+games+list PDF link annotation
    • http://topbuild.net/content/xuploadimages/file/34165635166.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/42014253129.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/178958362.pdfIn PDF document text
    • https://kinizsibank.inweb.hu/_user/file/bakuzo.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210910165927.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/bumafekuxajaze.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/34623941938.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/putezifokedogovaxu.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/mofamivodubaba.pdfIn PDF document text
    • http://timebymtm.com/upload/files/wetirajejal.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/92385265393.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/kuwimaxiziva.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/518534698.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/7160200846.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/92044240043.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/kopusovaj.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/79450596586.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d134db9f79---vulapefurud.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/waluzaxolawimemidodik.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/57264402239.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/fefiletibemebogeg.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/fesosufumasewemuti.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/08/file/kufimago.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/tuwefimofipumo.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109151548365888.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/61711728437.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_off0000b0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 15256 bytes
SHA-256: d64005869fd9e9c109d7a8a2c5dc04c950c7651c37232d189914b756c943f81c
font_02_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 10660 bytes
SHA-256: a3747f6302aa38c6a61798ea198e57267e0dc8069e7de28a376330b7f150a88d