Malicious PDF — malware analysis report

Static analysis result for SHA-256 8489e65193feed11…

MALICIOUS

PDF

71.0 KB Created: 2021-09-21 21:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4f2f7a63e275629080fd0f7e0798280 SHA-1: acf7f3ba59d8c7cc54f6fa1f802896ac2c06f944 SHA-256: 8489e65193feed11b79302b6e0d55cc7073eb74acfa85871d212c730f665724b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. While no scripts were directly extracted, the PDF structure and the nature of the embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://alles-vom-schreiner.de/userfiles/file/33470666991.pdf In PDF document text
    • https://vespaclubcagliari.com/userfiles/file/81024950779.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613017f784f15---9927860450.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/jamatugorovifuwibo.pdfIn PDF document text
    • http://belst.by/upload/file/turelizobeva.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/7210682835.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/pejifuziwupez.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/wibobux.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/98053088408.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/sirorozetinu.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/puzalolidarodu.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/vizanexoxa.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/2615315927.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/80271835972.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/92941117388.pdfIn PDF document text
    • https://medtek.vn/storage/file/pitewewuja.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/85130537153.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/94838623733.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/23681660554.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/73477265068.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/21828686233.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/rinidema.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/31784032578.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/torugisululexomarejiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=data+structures+and+algorithms+in+java+2nd+edition+pdfPDF 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_off0000b5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 11484 bytes
SHA-256: 2af1c5be86f55daad6500dc94a1fe2ba39953438e1bc9da98c97b2ac2a07c69c
font_02_sfnt_off0000e8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 14956 bytes
SHA-256: 8567d4335d2c846fde11af94e32f90bbdf92a0e8a100a2b8423de07a9dc20b32