Malicious PDF — malware analysis report

Static analysis result for SHA-256 4359a62af882fbed…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 11:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa4fddcdc3f343737b41f5e7b71c4571 SHA-1: 4a18eb3bd70b63358fcaa70c46719cbe68278786 SHA-256: 4359a62af882fbedeacf7d888fade1a87ed578b9a2af352ffb38f117109a2890
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, a common technique for executing malicious code within PDFs. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/mororiri.pdf In PDF document text
    • http://rasciindia.com/firetech/ckupload/files/fupetedageladotolujared.pdfIn PDF document text
    • http://friulanapanini.com/images/file/62566968413.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/81224972616.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/27024306346.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360dc1d4351---63219741339.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/98573215057.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/96795956017.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/makixibefozuken.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/32387765375.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/fotapobiwo.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/nanokede.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/wagerub.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/negovikikogisodebomapinif.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/dowegorafuvimevujosinake.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/mubokufudotak.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/26030321876.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/riwaza.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/23899341073.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/ruxomopi.pdfIn PDF document text
    • http://mutitar.com/user_img/files/bomesadefetunuj.pdfIn PDF document text
    • https://vientangluc.com/upload/files/tabofavevuzovumazelepizer.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/49962043080.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/godituminaniwenuvodok.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210908162754.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-4/20210904221619414520.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/31218545239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=view+source+code+in+chrome+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_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 10648 bytes
SHA-256: 50872be129a6f4fe6775fc754fc687bf12cf2a5ec99cda3867de0d31ac053e3b
font_01_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB3 18208 bytes
SHA-256: fd066ae548cda3d5c20d6d8f259616f3cb076ae4ec23ddac14db38c2066fe1db