Malicious PDF — malware analysis report

Static analysis result for SHA-256 b587c2c85f6aeb21…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 00:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 810c0c95569120c5c8a29972e9296fb4 SHA-1: ac2d43cbf55d6e271356c369e853883ce58eca4f SHA-256: b587c2c85f6aeb2152ce4b39e76b82371ba8217076b4ac97bfd2328d20a05780
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The PDF structure and heuristic firings suggest it is intended to lure users to malicious content or facilitate further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/kijerufaku.pdf In PDF document text
    • http://spellenindex.nl/images/uploads/13438741919.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/xikerup.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/pumerixowuziwet.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e686615ba---83706971958.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/25321441678.pdfIn PDF document text
    • http://schokozentrale.de/idata/gikoditonosake.pdfIn PDF document text
    • http://wajl.net/img/file/202191122032.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/79376665586.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/vupupez.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/jevakeba.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/8503634326.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/13050240210.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/89539521843.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/78197901573.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/15842981338.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/64315545471.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/68639592062.pdfIn PDF document text
    • http://usagimatur.com/files/others/71446506357.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/bolunowujaluduwipireti.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/73446305018.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/8597884299.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/38790729505.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/p7pn6qc9i5koo2adb24gqjiofu/xivekuroferilib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=disable+touch+vibration+androidPDF 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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 18288 bytes
SHA-256: a817907765d7b840e89241a7cbac68e6e4ec58b3c8be7e878a61965b800813f6
font_01_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 10776 bytes
SHA-256: ae404f759c2dedf5166f175967edaff800dfbba120d66a092c4b1f6dff994b97
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1