Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb056165a591fb94…

MALICIOUS

PDF

88.1 KB Created: 2021-09-21 23:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c2c2f4bd5bec529794eb2caa0088cec SHA-1: 3c4f7f6f83be71858c9b8855d86753af5de17804 SHA-256: bb056165a591fb94b458e1381a71e892d365868f3acba05be1da09a3dfa75cb0
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to a link farm suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to redirect users through multiple disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://4seasonstours.in/userfiles/file/kuwaxakizulefazidara.pdf In PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ebe08060b8efe52ed06b77ac748c48bf/dakojavitepegobifulas.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/ruseru.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/44148442355.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/nexekax.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/18168133752.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/motibosegivimamusijosama.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/52677924168.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/44882703747.pdfIn PDF document text
    • http://zzlhlt.com/userfiles/file/LianMeng202109171155206399.pdfIn PDF document text
    • https://sainaudit.mn/File/40581713127.pdfIn PDF document text
    • http://eternoohydro.com/d/files/gigopubagisinujitimi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/romufelinilifevokafa.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xifewuzubivefubefotuj.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/91579297591.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/xusodezuvolavewulerosawi.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/46739464758.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/zerufozip.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/16131399595.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142b9b95acdf---53322928778.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/41364172398.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/51328665101.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161430c11be18e---67706460717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=above+all+by+don+moenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 10252 bytes
SHA-256: de1652fec374c0d16862bc2d866bbf43914303f865536a0b94fea368d3ed221b
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 17688 bytes
SHA-256: 5391f895a3ec16d6bf10ea26dee9611718fc6ee958fcf1c64415b27337748d7f
font_03_sfnt_off000135ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135ED 18136 bytes
SHA-256: 8564e2b5b91338d0a71f7ec0d29089d79cba09b479265baec6346bc86e0c7698