Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72cd50472c345e8…

MALICIOUS

PDF

71.3 KB Created: 2021-09-09 15:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 076a7e0da0a71cfc7a73724b4bb37857 SHA-1: d76429aa7092dc69355330352fec575bc107e065 SHA-256: d72cd50472c345e8a1c16c428cc1c9303a1ccf547fc955787119bde512204445
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The PDF structure and the presence of JavaScript suggest it's designed to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://baloneacessorios.com/_upload/file///temopinosimupiwuzuf.pdf In PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/mibatubigexax.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/34211285353.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9c23b98d7d06e226a619ae97eea9d1e0/sasanofefo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af2e2e0e5---49042074289.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/gusafotulixusivebatepuzi.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/17837048001.pdfIn PDF document text
    • http://boldogelet.hu/media/poweve.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/8779260992.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/60783771950.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/96258539421.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/losugewasezaki.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/97110657878.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/lewaxawesegefavuloxexokak.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/datojifaxizadu.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/77591190620.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/95439423229.pdfIn PDF document text
    • https://phm.vn/upload/files/40754117336.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/20367500155.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/75601275728.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/wiwafimoduzafevizanigot.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/sudiwo.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210904_FDF95E998A8F9781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pes+2008+android+apk+downloadPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/90827553070.pdfIn PDF document text
    • 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_off0000b60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60E 15644 bytes
SHA-256: f09c069512ea0b0f21c999b46ad77e73e4902a367bf768b2c13e1d00e3104358
font_01_sfnt_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 10916 bytes
SHA-256: 2bdb35fa15b59d6dbba0855447e20be457d5338c474aba4d417fe0690f6813ac
font_02_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1