Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef00309ba95cb76…

MALICIOUS

PDF

72.8 KB Created: 2021-09-20 20:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cdf065344c079f0d0f59395cad7b3ca6 SHA-1: 7c939b6cab84d6e2b8cf76a0d8d6786601fa1728 SHA-256: fef00309ba95cb761b40e0d62ef6c0cc41cf3cd714d062812572c8d9f1b3419d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host multiple links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were extracted, the presence of numerous embedded URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/1701372653.pdf In PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/jejov.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/buxetudefujotibofirara.pdfIn PDF document text
    • http://rayanchem.com/d/files/karodonekowaxojavugizofew.pdfIn PDF document text
    • http://superbarter.sk/media/file/fisitasixakefutikow.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18b61bae5---61609204130.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/51449673167.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/75333417236.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3dc542f7de136c81491fb1bd4f88d167/57759728479.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/furogagumajozujafar.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/sudowalojifuzenenesejara.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/28245885812.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/46316544550.pdfIn PDF document text
    • http://netart.hu/userfiles/file/mabikokofenujalugiw.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/radinowepufaruvitexabopir.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/9125730644.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/bevamokotejujudewogemafer.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/wuboxubowigumekibowawa.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/zajizokozolorugobunino.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/vubomedimol.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/36875549353.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/movarelajewopalegojosu.pdfIn PDF document text
    • http://garderoba.sk/images/_file/vosepizukabel.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/88216216343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vlogu+mod+apkPDF 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_off0000ba3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3E 10204 bytes
SHA-256: efbe642b7324207c7df6a06d7a2a285e42545c31c2487cbbc0a28a5204c54cce
font_01_sfnt_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 17252 bytes
SHA-256: af1349e461ff5b746f8af7b717623223e138ac639f072410e023e6752eb5e9ee
font_02_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1