Malicious PDF — malware analysis report

Static analysis result for SHA-256 62668fcf7c8cb15e…

MALICIOUS

PDF

70.3 KB Created: 2021-10-03 06:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 52e99a6b73be917719151643255edf2f SHA-1: a186e03b95498896a88da9bdf81574dafba3884e SHA-256: 62668fcf7c8cb15e6cb80f0d7169a472f3727b017c7d394743c3e5bd24517055
146 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 trojan threat. It contains numerous embedded URLs, many pointing to disposable domains and one directly to an IP address, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's primary purpose is to host a large number of links on low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bu8m3tas68s-b1.com/contents/files/36048839688.pdf In PDF document text
    • http://beijingteye.com/upload/files/fuzakabivek.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/xosojewuvadexafo.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/vapokevutuzapupamek.pdfIn PDF document text
    • https://riwg.in/userfiles/file/49979864059.pdfIn PDF document text
    • http://www.centralperdana.com/file/66828369889.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae65b34149---dejobaxewivulibuvuxupa.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6155c83444788.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/nupurumilu.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/wepawawidevajupegaxurof.pdfPDF link annotation
    • http://inica.org/files/file///xegiditupusufejize.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/41269010501.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/42338114842.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/58962002199.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/thpvefgbk7n8iuhiml0h4m6orc/39099127738.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/nisefawazerotaguzodevam.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/nenugamojikefewagutokiwu.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/tolimeguvuxibozokitaxisod.pdfIn PDF document text
    • http://effekt-film.de/files/file/8780615691.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/nukuvaz.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/ruzokarofitijuwukazodivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=watch+lady+and+the+tramp+2019+online+free+123moviesPDF 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_off0000b08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 11692 bytes
SHA-256: bab81a292b068236dd5c50c4bd8b97b7023d391485e5986ff7f28f886d2cb516
font_02_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 15068 bytes
SHA-256: 3f34731420543b418e7c7ddfebfc8c90cc9307d332fa7d37aba1e39a992d9d23