Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab90bcb100bf7a5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 22:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4502380454b1d880bdc7c13ea5b0b0a SHA-1: 1e31a3975ed54fda209d8dada1690ee6b22123db SHA-256: 2ab90bcb100bf7a5ac2a011e800ef8810a2b7cfb6576ea1dac5cff42f2e31d43
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to host numerous links, likely for malicious purposes.

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 https://queure.ru/uplcv?utm_term=allow+display+over+other+apps PDF link annotation
    • https://champion-osk.pl/userfiles/file/74891225736.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bitovedal.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/65618506394.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/17485293516134ebd0dcef3.pdfIn PDF document text
    • http://artospace.com/pics/file/fotejesetafalasatagi.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/90644911249.pdfIn PDF document text
    • https://synersys.fr/contenu/file/nukerifikuberaravutej.pdfIn PDF document text
    • http://stattus.com/assets/file/3513520530.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/lalebawaxozogetin.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/vadevafopuralafuku.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/jutategipifebuzigilid.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea76870689---72668267527.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/rogavakiken.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/49464656806.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/31265626015.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/84975673224.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/21301521587.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/mopujovezago.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/sovedujapifax.pdfIn PDF document text
    • http://anm-av.de/uploads/files/34416210148.pdfIn PDF document text
    • http://smirna.pl/files/file/fifigarut.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/fopujosusurosozakalajatab.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/19865810607.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/ruxafotaw.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/47997023859.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_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 17440 bytes
SHA-256: 9260ae965f8acaaddc630ee9510a8f8bbeaaf1f095ef852f9f131f2db0c632cd
font_01_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 10632 bytes
SHA-256: 4c5978b1e4d2c731435fa2415b796ff7a97fcf127d7842c4908e7d7579f7b606