Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c743aff626a78b7…

MALICIOUS

PDF

95.2 KB Created: 2021-09-19 23:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95c27c813f4d681271cb1085a7cf77ca SHA-1: daf88c48b95ea47473383ddfcf7521fc6f26c4bb SHA-256: 1c743aff626a78b7865f7d6da0f6837bab1d80749a4c53b10679c27976b32eff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://autoprofi.ua/userfiles/file/14893487310.pdf In PDF document text
    • http://mfcpavpos.ru/file/54677671221.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/rapoguredufewezu.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/pabilep.pdfIn PDF document text
    • http://szhlfz.net/upload/jimofoweduva.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/tufipopepavumuxoxigep.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/8dffc556ecec04c1b2904cceb7dffa67/legokevesojunomo.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/68588875031.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/lirirojekimer.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/ditaguxofugef.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/vukutarowefopaso.pdfIn PDF document text
    • http://atya.eu/files/file/dawofarutevozol.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/31839539528.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/45337755730.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/kuvorofixogoz.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/18911128359.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/96684216604.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/pupofedilo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/91488339202.pdfIn PDF document text
    • http://kd-council.com/upfile/files/kadelelidigatatafuguji.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/jawerinexebolapim.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/32718340482.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5d77eb06---27521839197.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/53042726865.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/ruwupisitoworowulipew.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/xisuviwidegubovusudasibil.pdfIn PDF document text
    • https://fratellifurloni.it/file/70130526994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+gentlemen+123moviesPDF 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_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 10664 bytes
SHA-256: e1283d2388b0ceba17b942f84384a7fdb2ac7142d614b4c5cde497501b8f1ca2
font_02_sfnt_off0001397a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397A 20048 bytes
SHA-256: bdf208048dd93b32e8b1c395f70c3ece0bedcf2309c514ffd0ff520f3443a0e2