Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26fbed865df8309…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 23:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8a8c19dd0da29f0816e29215a58cebf1 SHA-1: 4908ea09f739e1bf513ce1c0a04ff434eb5390b5 SHA-256: a26fbed865df830961d7e881c23fbd6357084f7c3486686a9e2c063803a3cdf7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://rfinshaat.az/userfiles/file/12859524499.pdf In PDF document text
    • http://farmaciafasolis.eu/userfiles/files/43310598565.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/61317277499.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/8356766309.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/xuzatagirofid.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/rirapesefexogagobilofajo.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/suwagitipasarapejajiz.pdfIn PDF document text
    • https://csn-alliance.com/data/files/97027824516.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/mepiremiloxajuxanifeposup.pdfIn PDF document text
    • http://happy-land.hu/editor_up/97500047452.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/fanimu.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/barajojojuxi.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/pakix.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/sabefedudix.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/gifutujuzemududumas.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/505810317.pdfIn PDF document text
    • http://guitarenko.fr/img/files/fuvaforom.pdfIn PDF document text
    • https://brs.jo/userfiles/files/tijogo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8torpaefb2qss8dnccl4p9ok3l/fetifeselubobekobos.pdfIn PDF document text
    • http://keyday.ru/files/files/nuxidazonilalujuranik.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210919_D247E4A31E18C693.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/91545564825.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/80908336011.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b0f23b7bf---75091373530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hd+photo+background+editor+app+downloadPDF 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_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 11036 bytes
SHA-256: f3e5f2cddf02b2b8c7e68b725babc8e37687468462b0610f07e218ce30895530
font_02_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 17564 bytes
SHA-256: d14c8a17cd4e0fa5fe271f50701507f3960dc75f61d7e55b90ffd089276ca120