Malicious PDF — malware analysis report

Static analysis result for SHA-256 2386e9a576552993…

MALICIOUS

PDF

69.4 KB Created: 2021-04-09 16:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfee37a656b0e525b3b179dc808c73e1 SHA-1: 97cd5828022aa004d9799e0cd19d619a9993f8f1 SHA-256: 2386e9a576552993a00b7df656b6b8cc0a372a14060498b77dab8c49217ca2c5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of redirects. The document body, though heavily obfuscated, suggests a lure related to educational materials, likely to trick users into visiting the malicious sites for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=prentice+hall+world+history+the+modern+world+answers
    • http://xoxosedefoxadu.mygamesonline.org/sparx_shoes_catalogue_2020.pdf
    • http://jopagozopive.medianewsonline.com/37417526823.pdf
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/3127901.pdf
    • https://vizudenorip.weebly.com/uploads/1/3/4/6/134674315/1124092.pdf
    • https://cdn.sqhk.co/madagijoj/GhbifeI/warotesopikiwali.pdf
    • http://universe1.space/balori_yorick_guideaup48.pdf
    • http://helpcenterbusiness.xyz/the_blade_itself_female_characters9c7k9.pdf
    • http://hardcreditcheck.info/tanudilmx7s.pdf
    • http://berkeciftci.net/florerias_elegantes_centrosi8olg.pdf
    • https://pavedivagew.weebly.com/uploads/1/3/4/4/134468388/e3c29dfa76f13.pdf
    • https://fudonorovivur.weebly.com/uploads/1/3/4/6/134665028/4547214.pdf
    • https://xolisibi.weebly.com/uploads/1/3/4/4/134462635/wiwen.pdf
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/ac3cbffbd.pdf
    • http://picsonair.com/wuzufosulasiprqu.pdf
    • https://cdn.sqhk.co/tororukiwuri/gjbgggg/bkash_customer_care_number_tangail.pdf
    • http://sizuxofutitarax.mypressonline.com/mugiwotigepizojomadojarep.pdf
    • https://cdn.sqhk.co/sirojenu/KzAhdhj/mi_signo_en_el_calendario_azteca.pdf
    • https://cdn.sqhk.co/bikugipozamu/hcijicl/white_hat_hacker_community.pdf
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/5395094.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vogapodidojuguf.myartsonline.com/21358172932.pdf
    • https://uploads.strikinglycdn.com/files/a5cbfbe6-1792-4d0c-9960-d2a2f57b8ba0/xuregatitarisupodezanu.pdf
    • http://polilofu.onlinewebshop.net/30129150758.pdf
    • https://uploads.strikinglycdn.com/files/def0f9f0-1812-4544-89da-94920b18950f/30391740773.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfca.bin
c9b94a7bf90883b49443ae25837a0444b137303c77ee0902465ff3b17e19498b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCA 5376 bytes
font_01_sfnt_off0000e1fe.bin
e00c74d0ca622a2aa3b1d6d1fe2c7e66cbf7e028865797c3ed154d52871f53c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FE 10580 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.