Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ef78b3f5db492f…

MALICIOUS

PDF

75.9 KB Created: 2021-04-08 01:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f0254561e7d237ad11878bc352288a92 SHA-1: 521343204bde0b7dcf7fd616193c0abb52d80ce0 SHA-256: 42ef78b3f5db492fba458c2a0dad6d04f1b55549d903712da3f1eadd11d8b037
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for malware distribution. The presence of numerous external URIs, many hosted on disposable domains, and a high ML classifier score further indicate malicious intent. ClamAV detection confirms this file is a known phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mezovuduw.ru/strik?utm_term=opentx+companion+2.0+download PDF link annotation
    • https://tipirigemiwar.weebly.com/uploads/1/3/4/0/134016889/843946.pdfIn PDF document text
    • http://rijoginijamibeg.mypressonline.com/65835167374.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/rotebefifuguwefebuxakod.pdfIn PDF document text
    • http://zzzmmmmejjj.space/hungry_shark_evolution_hack_firestick0f5tk.pdfIn PDF document text
    • https://luludexo.weebly.com/uploads/1/3/5/3/135322363/b575bbbd3.pdfIn PDF document text
    • http://myfirstsite.xyz/77275490228ozt8k.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/danibufulojisaf.pdfIn PDF document text
    • http://fishland.store/power_book_ii_ghost_episode_9_release_datebaby9.pdfIn PDF document text
    • https://tezadogiva.weebly.com/uploads/1/3/4/5/134522012/7ce86c.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/ihcfGMW/codashop_myanmar_pubg_uc.pdfIn PDF document text
    • http://midebozizigod.iblogger.org/fosemegoxizofiruku.pdfIn PDF document text
    • https://cdn.sqhk.co/xezakomujar/GjgfjiE/fawuxewaxoradagupelixaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sadabodavezuzi.epizy.com/66017648307.pdfIn PDF document text
    • http://jigisasamupor.onlinewebshop.net/72576884578.pdfIn PDF document text
    • http://jizanisan.epizy.com/fuwodemijipi.pdfIn PDF document text
    • http://juraxiza.rf.gd/is_harry_potter_on_amazon_prime_for_free.pdfIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_e4d6544065be4c8a86e0b5480df66190.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_c873bf3ff81c49e3b7ef57863ac32d25.pdf?index=trueIn PDF document text
    • http://bimumebuzof.epizy.com/gofixikirik.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_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 5436 bytes
SHA-256: 4840fd587b8d7bea7b1f5ddf0704e49a80be6bb28db71d66f86045b010835414
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 11960 bytes
SHA-256: ca2f24949a786e35b3b3068f26b714a42fb56dd876c93ff11dbef637ce7c7beb

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