Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a92c5cf667312f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 01:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18e6f9f67a389e4747d2c31ee152874f SHA-1: ced4c774f328e8125d84de3224450101015bfba1 SHA-256: 31a92c5cf667312f5a66f1b061a8be1f6593effb23d92262920adb975c5d1945
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The presence of numerous external links, many pointing to PDF files on distinct hosts, suggests a link farm designed to obscure the ultimate destination. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content, potentially a game download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://prosaison.fr/userfiles/files/rizuwopejonesegulugugakix.pdf In PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/zetolemebapewawebodumuvo.pdfIn PDF document text
    • https://onecre.com/images/content/files/gamezafujuvujewojoj.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/3466870711.pdfIn PDF document text
    • http://imaginove.eu/data/Files/niravoriju.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/wudimo.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/bipukubanatod.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/famukewipudiveziguwavog.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/posufuvuxafukiz.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/wijusopakewowibozirowi.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/fotakototokibesalowolot.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/90022914376.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/murupuvarekorope.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/wabuxijawatelosituralig.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/59849318403.pdfIn PDF document text
    • http://zenkatsu.dk/files/64213112325.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/21757308087.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/pijojubulipekada.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145812e3ba0b---92842444445.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/superulima.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/25714753449.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/fesugurumidolopuvo.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/rametabirewisuj.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/wudazolodifaxiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+game+lost+life+2+androidPDF 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_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 10904 bytes
SHA-256: f89eb292e9865ed104af14bc468b22ea48a9e6f704a69cffb36c25f11ee34d48
font_01_sfnt_off0000cc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 14976 bytes
SHA-256: a2cff1b4fdc6afde81bd435eb2245af912b07560292f0bd5af5d1217dede0547