Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb6f40e753e4b16…

MALICIOUS

PDF

67.0 KB Created: 2021-09-27 04:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a611345e68f5457c2464f4dddbcfab90 SHA-1: 9b3174d53033482a02b719cfbb98986b8c718b10 SHA-256: 8bb6f40e753e4b16fcb6db528c934b992035c5eb5498c679bac5b2c529b1366c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and a small file size. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, some of which are hosted on potentially disposable domains. While no scripts were explicitly extracted, the ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or redirection to malicious sites.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allseasonsart.com/uploads/fck_uploads/file/zitano.pdf In PDF document text
    • https://arte-salon.ru/upload_picture/vomim.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/madegaxifimuwudaladib.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/dumonum.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/65569080181.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0081961001632474650.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/68033900946.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/59921806158.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/9528541833.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/15121830810.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/rodopaw.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jugoreronisutexafapo.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/bebebowupaduroke.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/12701857822.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/25713122491.pdfIn PDF document text
    • https://profesa.net/userFilesfile/figawazagetidujus.pdfIn PDF document text
    • https://network-italia.it/file/lobuvalijekikefononalog.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/wimamerasajapopubilema.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/fumiwewugivivukorivux.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/30609262414.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/lunudujizagoko.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/60787308033.pdfIn PDF document text
    • http://modern-pro.ru/files/file/26041117822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bajirao+mastani+online+streamPDF 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_off0000ac10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC10 14032 bytes
SHA-256: 6efca9f7e98e7d1a19309b86528c506a804cfe3950f82c0984238c8cbd8a414f
font_01_sfnt_off0000cee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 10452 bytes
SHA-256: 6c71083e2e934fc1247dd5cc718a7283e80fbf7ca1818162a2c12db9723ebef7