Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac8145243e7ed16…

MALICIOUS

PDF

76.8 KB Created: 2021-09-09 02:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e391e0619884a5b5dcc61315ec55a73 SHA-1: d3baa43b4b3a6ceebf96c6b3c71d6064b469d76f SHA-256: 2ac8145243e7ed16a069d33da38b671fe707d79971e5036563d3ddda7094d498
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm, with many distinct hosts and a high number of links per host, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://detector-billetes.com/Imagenes/file/1392589282.pdf In PDF document text
    • http://nbmounts.com/userfiles/file/1630500721.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/4778500793.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/sofuzepaduzugogumuvige.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/22509295836.pdfIn PDF document text
    • http://ipceurope.be/assets/file/46121169289.pdfIn PDF document text
    • https://mmtours.si/uploads/reromurowebowogafasowolo.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/30350279269.pdfIn PDF document text
    • https://electroagro.es/pub/files/99205412922.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/marubamuvazubuki.pdfIn PDF document text
    • http://autonoleggioassereto.com/file/goneravojuxipelumilo.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/puzenex.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613887dcd82b6---31972292690.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/28855700907.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/17465882785.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/xojirugupuxufomiminik.pdfIn PDF document text
    • https://adikketiga.com/contents/files/22080258543.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/tixonatidezi.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109021012409895.pdfIn PDF document text
    • http://computerdoki.hu/user/file/89058996971.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/20767757173.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/xamigotafubazusaw.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/99203743338.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/67058207342.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340ae5b5193---42310350733.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/73806007864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sex+apk+modPDF 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_off0000c63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 18652 bytes
SHA-256: feea02fa7b9680f9ec5c89fdf9da0299ac307c0f12d7628d984a06ca81ccb6b4
font_02_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 10212 bytes
SHA-256: d48b45558d6d581be7c55542fc77ad4c658dcce2e5dcb3c802a802b9bebfe104