Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfb516d141e38c3…

MALICIOUS

PDF

83.2 KB Created: 2021-03-31 10:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66edfb126cb45eb484438b7b5900f6c7 SHA-1: 5c65aaadfecb739b8699b9bd363b9939999816b2 SHA-256: fdfb516d141e38c34aa9358dca75eb991c05e4665523153c52efce5f765d84a2
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including external URI links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF. The embedded URL points to a suspicious domain, likely serving as a phishing lure or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/123?utm_term=building+construction+agreement+format+in+telugu
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/1886657.pdf
    • https://lekusimije.weebly.com/uploads/1/3/1/3/131383821/wubakixesopeduzukepo.pdf
    • http://tujukesabegakom.mygamesonline.org/does_my_head_look_big_in_this_analysis.pdf
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/878167.pdf
    • https://cdn-cms.f-static.net/uploads/4485322/normal_5fe9037f5ee00.pdf
    • https://cdn-cms.f-static.net/uploads/4426271/normal_5fd1d55f24730.pdf
    • http://bavipame.22web.org/brian_tracy_books_in_urdu.pdf
    • https://cdn-cms.f-static.net/uploads/4377925/normal_604d252f1eab3.pdf
    • https://tupumerar.weebly.com/uploads/1/3/2/6/132695397/3462703.pdf
    • http://xenalebosob.scienceontheweb.net/nofesepawezamoxod.pdf
    • https://cdn-cms.f-static.net/uploads/4465024/normal_600dea62d702b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/bufexa/draw_me_close_sheet_music.pdf
    • http://fogesogorukob.epizy.com/nombre_rationnel.pdf
    • http://wurekino.epizy.com/32995432284.pdf
    • https://s3.amazonaws.com/jusagi/sql_server_database_security_audit_checklist.pdf
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_31c92dcef6ae47afacc3a21d1daa3f9d.pdf?index=true
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_4a094ac9e6564610b4710e1dccf81422.pdf?index=true
    • https://d4a58959-25bc-41ae-a48c-99f47e3c4711.filesusr.com/ugd/4dab1e_473c83348792496ca2b5b0c9169dfa6b.pdf?index=true
    • http://duwugupexajas.epizy.com/91518322122.pdf
    • https://s3.amazonaws.com/vuzufexarevima/27372429958.pdf
    • http://xorewabamav.epizy.com/gibusakaziloxabuwenuxek.pdf
    • https://s3.amazonaws.com/mejobu/nsw_health_child_protection_guidelines.pdf
    • http://jusopetikikij.onlinewebshop.net/pavopozaburoxawuvodagomi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed67.bin
43f3cc4ae91302098def36f750b325579292e42904fa3b91b9d93ec45ea44ec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 5388 bytes
font_01_sfnt_off0000ffa3.bin
6f097203a9e33095ace115061778de27e7f48ceffb11dc5a1c9428a3a95d195b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 8624 bytes
font_02_sfnt_off00011982.bin
9d5854ab0999d534aa3e40496e8d024a5035926d513d8ed7c2a6d813e634df58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 10964 bytes

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