Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96e150d932179c8…

MALICIOUS

PDF

71.6 KB Created: 2021-09-26 04:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7d890661eb1df6fc6fcb1d3df67ab17 SHA-1: 5181aea0aae9c835c70a75f8f13007a1f0ec1128 SHA-256: f96e150d932179c8ec6bfb6173e591fc3addcf6233ed2a0e1d8133ae773f559a
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, identified as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no explicit script was found, the structure and URL patterns are consistent with malicious PDFs designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://webmba.fr/client/logo/file/32683840762.pdf In PDF document text
    • http://fruitsad.pl/images/file/bolejazorubejemisasatur.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/wonivitivutim.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/84683799793.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/52195417473.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/28438376141.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/11030652148.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/84487224367.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130aab8360b3---kazasepewujeresipenepedog.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/pitenawoj.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/jibanikafagitosufuxem.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/13746217247.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/63984847500.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/41428141518.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109140452187057.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9884eb060f190c9d4a879da53ccdef10/gitupikezujogokonudemixaf.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/71868542327.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/80142322896.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021092005332573499.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/norepirovo.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/nimakamubokorifo.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/saluvelipodiletob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=windows+usb+installation+tool+for+windows+7PDF 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_off0000b009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC820 10584 bytes
SHA-256: 19b06d42af386ea2f50edb60c2144d6da128d10c6712aec203fab87d28f8dbc5
font_02_sfnt_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 18564 bytes
SHA-256: 6a7119376c20874af82ec5469ecf123a17968c41f9980eafacd2a1d01a06fab3