Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9400425266ecaa8…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 16:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8fd080e90dad9380dc2e88a2f46f6d9d SHA-1: b83f1729df9bee31a70b984115aca9ea6c6dffa0 SHA-256: d9400425266ecaa8a9151ad3625f3a51bc38685b5ece4e155527a61e65d9742c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=live+wallpaper+with+name PDF link annotation
    • http://myhomeinparis.com/userfiles/files/pejolisusabanemokovi.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/40289138730.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/99512783001.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/59996642674.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/58757607849.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/gadolaz.pdfIn PDF document text
    • https://jagominum.com/contents/files/suwakidasefuwidu.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/sakajemifebo.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/vuwulesa.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/25055709608.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/91mcjc7fgp8o5ovbl5b98mrdfh/39674653284.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/44239356294.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/19001040778.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/ramudagi.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109022115117112.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/rovujobasexejavi.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/lemilavatiduluro.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/88231613303.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/kexujizepal.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/97115322557.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/14283903823.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/56352431756.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/lilugexorujufagabaj.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/xiwawidilumagadonagutage.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/67767052787.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161438767bdc97---nuvikapunavimugu.pdfIn PDF document text
    • http://haki.vn/uploads/files/tewuloxajelefuvojaxata.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_off0000b75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75E 10336 bytes
SHA-256: e428a47c31e75628f90542d4a723a4638236a0545ed5aa15c199626b72745246
font_01_sfnt_off0000ce7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 16440 bytes
SHA-256: fe6f887d91c938afcd8cb1d04a640cf144704985a094d2bcc037e370198d2425