Malicious PDF — malware analysis report

Static analysis result for SHA-256 f330271414dbe770…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 03:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4218ee96286bcca35697a5b76524fc2c SHA-1: c924d1104e6dc6d3277fc2968ed52a9d41b88243 SHA-256: f330271414dbe770aed55b37a7f7eb48d03f6251cd1163916573ea3d86bd9baf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting and a callback phishing lure, suggesting it aims to trick users into visiting malicious sites or initiating contact. The presence of numerous embedded URLs, many pointing to potentially untrusted domains, further supports its role as a distribution or phishing vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/85mbj2ued9jlslg9usm4u0ok1k/gegarux.pdf In PDF document text
    • http://protezas.lt/i/File/logidafoxabiduda.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090120554473499.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/88385502404.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/71965132674.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/66116877180.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/duzajarupimemubexirezopog.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/tufimazu.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/bogifenogewujifodeloxet.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/kasenewelafa.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/88468843039.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/jibulunozodevubuvugep.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd010e9b6---34288173919.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/mimojone.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/semujixadajegaxotaj.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/36803657263.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/sosidizawobesofafosajow.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/42054039330.pdfIn PDF document text
    • http://marine-inox.com/i/File/1274915026.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/wibodul.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/ranepemeginetalovajifo.pdfIn PDF document text
    • http://vinmexindia.com/uploads/nanulagemun.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/95237992950.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/66529074642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=iphone+7+64gb+price+in+bangladeshPDF 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_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 18920 bytes
SHA-256: bb1edb38d2d46fd0cf72ad24913d9befd3c63cae3e091029aac8e1b47a9410a5
font_01_sfnt_off000114a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB7 11084 bytes
SHA-256: 230e7bbd16c3cc77284da0f65fbeddac83d589a8b418b8e961aacfd8159c65d0