Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0be34f8436ed89…

MALICIOUS

PDF

73.6 KB Created: 2021-03-30 20:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2663cb82b5805e4797fa2c14533430cf SHA-1: 226195d79fdf28dcfa87c72d5f99304f58adec8e SHA-256: ef0be34f8436ed89636c85b0317925b857f35bbbac0b671be1fb57850a5ad449
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to disguise the malicious intent. The embedded URLs, such as 'https://kuzutuzo.ru/strik?utm_term=resistance+band+seated+bicep+curl', are likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://kuzutuzo.ru/strik?utm_term=resistance+band+seated+bicep+curl PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427509/normal_6044d534666f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499656/normal_5fdae200e6725.pdfIn macro / runtime command snippet
    • http://vatemuredaxusob.22web.org/hppsc_answer_key_hpas_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fd1fe3c5dbf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_6017c8fba968c.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/idggdic/us_wars_and_conflicts_timeline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_5fdb318fa24df.pdfIn PDF document text
    • https://cdn.sqhk.co/zegareguw/j7jbArJ/52611695756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410985/normal_6021a2e6ea7b5.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/hfhangf/business_plan_steps_template.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/idjh8zY/gmail_customer_service_phone_number_24_7_usa.pdfIn PDF document text
    • http://vajogeboru.iblogger.org/accu_chek_performa_e_9_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_60322fbfa739a.pdfIn PDF document text
    • https://cdn-cms.f-static.neIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pujinit/aambala_movie_songs_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/13663304885.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/blackmart_apk_2018_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/95181698567.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/messaging_apps_for_pc_and_android.pdfIn PDF document text
    • http://kefujuvaw.epizy.com/hashar_punjabi_movie_full.pdfIn PDF document text
    • http://xisamilar.epizy.com/bobine_tesla_fabrication.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_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 5216 bytes
SHA-256: 283840f3ebd712cfa3c378cd98f7e9c5dff150554e83408587193912eb344173
font_01_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 11136 bytes
SHA-256: aee7a7b2376e6e17fdeb02433d7ce44fb224068a0daecb5d4e952814b9b3fa31

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