Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2dc3d5845603335…

MALICIOUS

PDF

69.4 KB Created: 2021-02-10 15:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8929e3e85bdf3a1490ebf1a6e6c5f43d SHA-1: 3aad0bf8b5d28ad2893e998a6c679d3f5c2c6601 SHA-256: d2dc3d58456033352356b02e53196279530744a7b3080cf6365dfe9563a94506
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'grammar exercises for class 10 pdf', aiming to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/wb?keyword=grammar%20exercises%20for%20class%2010%20pdf PDF link annotation
    • https://cdn.sqhk.co/bitomasijelo/44gjhed/texas_outdoor_annual.pdfIn PDF document text
    • https://sorezoxawo.weebly.com/uploads/1/3/2/7/132712551/9a36e748.pdfIn PDF document text
    • http://dress-russia.ru/eggbot_vs_zombies_armor_gamesnnyon.pdfIn PDF document text
    • https://cdn.sqhk.co/zonurubo/qkjhGgh/exo_members_ages.pdfIn PDF document text
    • http://table-wait.com/bluecoat_proxysg_admin_guide_6._5xur21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485015/normal_600a4de3693f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_600d50336ae18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382639/normal_5ff716545ebb5.pdfIn PDF document text
    • http://italy50wow.pro/vavamazeraradelatovizuwz2ry.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/3Cjicgg/40280355326.pdfIn PDF document text
    • https://jemidezegin.weebly.com/uploads/1/3/0/8/130874295/zisovul-baxikudovokuk-fanipiwal.pdfIn PDF document text
    • http://blu-ital.space/97250664319rv7jo.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/gdghiaH/76726948075.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/6225625.pdfIn PDF document text
    • http://myfoxing.online/11593041250ub5v9.pdfIn PDF document text
    • https://vedefagam.weebly.com/uploads/1/3/0/8/130814874/7786296.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/9hfgcmd/goat_simulator_free_download_pc_game_full_version.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gopikobupi.epizy.com/87537165306.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 5596 bytes
SHA-256: ca5ebe5de1027d194c4a290df3337a4dedad793d0791ff73d351f7a5d061dc7e
font_01_sfnt_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 10896 bytes
SHA-256: 3d5846ba630669d6810453453d20ad43cb5ec402794722f1c0b162fc0bce8fbe

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