Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aff78358b6d1fd1…

MALICIOUS

PDF

83.9 KB Created: 2021-03-18 20:07:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e08876ba98709d82a60044222256d8cb SHA-1: 8259b5fac5ec6cb4484d320581c53cc28751edd2 SHA-256: 8aff78358b6d1fd1efc1b982870d7b86f62dd2d289d8f63d6bba2d6db2d9da8e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a 'castle clash guild royale mod' lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to disposable hosting, suggesting an attempt to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://leonvi.ru/wix?keyword=castle+clash+guild+royale+mod PDF link annotation
    • http://lexibanoma.iblogger.org/13802135963.pdfIn PDF document text
    • https://zupalopozaguri.weebly.com/uploads/1/3/2/3/132302876/kipukex.pdfIn PDF document text
    • http://vizit.store/2008_yamaha_v-star_1100_service_manualhwmdr.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/zumemokaj.pdfIn PDF document text
    • http://kesevosidavob.22web.org/gulitekaxezajixuvokawuwed.pdfIn PDF document text
    • http://kefozeli.22web.org/cavaliere_range_hood_repair.pdfIn PDF document text
    • http://kijubol.iblogger.org/airman_compressor_pds390s_manual.pdfIn PDF document text
    • http://bellissimo.online/forafalalezaoyzhe.pdfIn PDF document text
    • http://sesulup.iblogger.org/cannibal_holocaust_english_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zatorir.epizy.com/4280821552.pdfIn PDF document text
    • http://temefolix.epizy.com/the_god_who_is_there_schaeffer_review.pdfIn PDF document text
    • http://segenuf.rf.gd/nepopaxupolepusepivejumas.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/divowalofisixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c5c70a2-2341-4735-9561-bca84102d8a2/duwuworumudob.pdfIn PDF document text
    • http://jekalabol.epizy.com/how_to_prep_for_an_interview_with_a_recruiter.pdfIn PDF document text
    • http://kunowulinivelal.epizy.com/f_distribution_table_0.975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd3889f-370e-4dbd-8e06-c8380306eff1/81053158329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/416d9b47-2898-4d03-8975-cc8f67172221/average_salary_of_cfa_level_1_in_india.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
    • 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_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 5360 bytes
SHA-256: 92ca7c8ae59f16553e83e83b39ff5b3721457e75ab235da0afc6917efeb5e2cd
font_01_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 13064 bytes
SHA-256: 7dfe16963e84efe0042931a91edf17a8c3ce8fc880200168dc3020f6defcfc31
font_02_sfnt_off00012c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C39 16204 bytes
SHA-256: d25787a4c26d5dfe11954a191e1a78b06a4864afc6c230ccab670610fb8eef4c

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