Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ddc0ff8ae85d8e5…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 12:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8e1a43f0b40fd4af2427510b6b44d5f9 SHA-1: b89fe747a463c4ebd503ed6b69973718aa5606b8 SHA-256: 2ddc0ff8ae85d8e5a506cca65a9342c1d269d30cc7dea8c2b6ca842782023007
126 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, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to host multiple PDFs, pointing towards a phishing or malware distribution scheme. The embedded URLs, though many are marked as benign, contribute to the overall picture of a malicious document attempting to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://nhatngungoisaoxanh.com/upload/files/kipibugixoxenofinemufu.pdf In PDF document text
    • http://jaluzipro.ru/public/userfiles/file/24544553091.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/nevowuduxajosi.pdfIn PDF document text
    • http://auvergne.annuaire-regional.com/ckfinder/userfiles/files/42142205447.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/pamaleb.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95639789293.pdfIn PDF document text
    • http://pronobile.com/catalog/file/rofarapamufew.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/74952109198.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/budazodinawunolujoki.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/78547523331.pdfIn PDF document text
    • http://dalaichau.com/files/dazediv.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614af653cd311---zadovigav.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/96698974477.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/94334817309.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/vozetuluxib.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/bixeburuzakutovolabiraxi.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/6500435698.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/fizaxufefuxudotow.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/26309920598.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/54372712788.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/52195583867.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/84332480597.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/nodubukap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pes+2019+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_off0000b2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC7 10240 bytes
SHA-256: af968ebe1705b8eeb144d043be7e8413fb70bd024caf42d9fba52b50d49c7b45
font_02_sfnt_off0000e213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 16384 bytes
SHA-256: a498b58abc603467d2e1ddc65663df8575999ef67c1b805b5bc458eab6fc778d