Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ac3f2e8849e5ce…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 13:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8091c67f4e23d9d4faa7e991c5b5ce4c SHA-1: 37a748dea9e66be794105d1b123c429eeea4c29f SHA-256: 01ac3f2e8849e5cefee037b57ca7705fa4e0e2181db7d3740b9cf410b8a2803d
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, and a PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it functions as a link farm. This suggests the PDF is likely a lure for phishing or to distribute further malware, rather than containing an exploit itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/xebugagewaxotibol.pdf In PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/92537615726.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbc9a1b23---90443555570.pdfIn PDF document text
    • http://web5gstore.com/Files/files/2523541519.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/velovivuzo.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/9455839288.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/96183195019.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/23135857889.pdfIn PDF document text
    • http://nincity.de/inline/file/fogubuvisedidewinona.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/99569572114.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/dawamulamumeval.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/37300462838.pdfIn PDF document text
    • http://strandedtattoo.net/file/demeju.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/35983840886.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/piranatojerorolorewugete.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kixulinakal.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/xeroxosuxapuxerevojukoli.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/lomemejinafapukarelogewe.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/nuwawoje.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/zebipivoxobitaxipijanodi.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/muwulirol.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/48576121537.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/94409668734.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/digoduxepuxugal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=kruti+dev+font+010+for+android+phonePDF 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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 19024 bytes
SHA-256: 9c445a73f4a5be595dfa3769db3a55d9a0b5ba3d40c02fb35655b98a8ad20b8f
font_01_sfnt_off0001071a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071A 10712 bytes
SHA-256: fce3b925a6eaf35dce8cb8dce0b485111ef3ba236b5f9c8832407b6bee57f473
font_02_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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