Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b15035d37f2484…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 08:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c958ec787931437bf393c98958b6720a SHA-1: d85a2d8046e726929dbfa81c7186cea480c4fd38 SHA-256: f5b15035d37f2484dfb375204f7ac8616e5c7fba0b45478a68ab11e0d79577b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it contains numerous links to potentially disposable hosting, suggesting a link farm designed to distribute malicious files. While no scripts were extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tonyprins.nl/images/uploads/file/jefexemubenulutula.pdf In PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/21829383100.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kawuzifixiwepagiloman.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/dixidobeler.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/83062204659.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210902_4379B7A1E9EB0CDA.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/28152941311.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/36799026227.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/gekeladubudanijero.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26605836366.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/58808681530.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/pobiwujobinofuboguvigisos.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/46271357653.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/46626638880.pdfIn PDF document text
    • http://salespate.com/userfiles/file/jozupi.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/43428489231.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/gutemaxiseradavifofuwag.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/fobura.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b3a87c188---zasifovake.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/jowemivusewunuvev.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1583400889613451291adcc.pdfIn PDF document text
    • https://oferta.lt/i/File/desapigaworafurevu.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/pufuropopusomanegoxawu.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/46211504874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=jb+gupta+electronics+book+pdf+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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 11204 bytes
SHA-256: 9b6038699b9260935f967e919e2936f7b835b693d4f58a69c28ef8e0df0a7224
font_01_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 17732 bytes
SHA-256: d8b6693ddf920b00f8e11152cf8f48850f40720498bc8ff4e086c59a0257b306
font_02_sfnt_off0001205d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1