Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f84171ab0f92051…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 01:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd4b585cfb51796b295ed2b620651e3e SHA-1: 3931481410eba7aba2cbb7126843d3b123325ada SHA-256: 5f84171ab0f9205105559609b673835d5351b8285956dff321432cd5c0667e54
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social-engineering lure to prompt the user to install a browser extension or update, a common tactic for credential theft or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect the user to malicious sites, potentially for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ymmicro.com/files/files/womuwisatemirifan.pdf In PDF document text
    • http://sahcarpets.com/userfiles/file/xetopipezilexap.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/23997090548.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/85675543995.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/9c4b43e20db85e7036ae90a01be8b85b/xosidaxanemonezurog.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/xatemizixutes.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d74eab76ca---jiminejolojatopisetug.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/kewugixegaramevajuwi.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/7971292370.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/25694558383.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/sobigokasogitidevavopi.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/xetedu.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/13197038375.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/22416170514.pdfIn PDF document text
    • http://hijoin.hu/editor_up/fibobamaporozowe.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/tumizaguzilekujaponeduba.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/rajomosuriwa.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/63627282481.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/13271461644.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/89724776711.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/wisinosipukavebizabofuxo.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/49155500867.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/tevozokoj.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/49694932466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=annoying+lazada+adsPDF 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_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 10248 bytes
SHA-256: 0fbdf26942051e65c34d872e00b2429fb2b674fd100a5d91fea96a448be9b7f2
font_01_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 17848 bytes
SHA-256: 056cd2c3b77710b2c8ebc1c7d5fe9330f056b18383de262928764d0670e86e9e
font_02_sfnt_off000127ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1