Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2e15ed2017d8c0…

MALICIOUS

PDF

73.7 KB Created: 2021-03-20 17:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b8a63ceb5ee32e6f573026ca2d53e523 SHA-1: 0c2540d7d5ac4d5c59b7e90a48b4105dbebb4608 SHA-256: ed2e15ed2017d8c05701c565b93b4fe899f8088cb3754d8a6475c2b69f03ea9b
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting. The document body text, though heavily obfuscated, appears to be related to search engine optimization or keyword stuffing, suggesting a lure to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=2008+suzuki+boulevard+m50+owners+manual PDF link annotation
    • http://nemosixumeki.mypressonline.com/what_is_the_newest_wimpy_kid_book.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/cjghcih/9297122241.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/xodiderobepodij.pdfIn PDF document text
    • http://nutigunejome.22web.org/yenti_yenti_whatsapp_status.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404287/normal_5fd0398170591.pdfIn PDF document text
    • http://vemelaribox.getenjoyment.net/articles_of_association_and_memorandum_of_association.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/padenegor.pdfIn PDF document text
    • https://cdn.sqhk.co/febenanedibu/iaH7Qjg/new_bollywood_movies_website_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jawezumate/lmze3mm/terasawagutukaf.pdfIn PDF document text
    • https://cdn.sqhk.co/totuzilexif/jahgvib/my_hero_academia_heroes_rising_showtimes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481418/normal_600fcd8e21e6e.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/31352239057.pdfIn PDF document text
    • https://cdn.sqhk.co/femelofep/OAsHShf/stickman_counter_strike_vs_zombies.pdfIn PDF document text
    • http://pejazadajenatew.getenjoyment.net/26683649866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_5fd6745741839.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxurulokij.epizy.com/gosireti.pdfIn PDF document text
    • http://gugosezufuted.epizy.com/robotic_arm_with_gripper_project.pdfIn PDF document text
    • http://tefuguwo.epizy.com/vupab.pdfIn PDF document text
    • http://nupenujopufidi.epizy.com/rakefafo.pdfIn PDF document text
    • http://luwulifinuneti.epizy.com/buyers_guide_salina_ks.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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 5876 bytes
SHA-256: 009da741be66bf915a0fcd6300c6a13aadeb8101a82d910acbfca61edcc73d82
font_01_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 10568 bytes
SHA-256: fc5823f8df31cbd692fac9e72c6543b023937b231bb3e86c9f0bd50dd75419a2

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