Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1f999dd6d64d38…

MALICIOUS

PDF

77.4 KB Created: 2021-03-16 20:24:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 88a726a643d328976f7a2a7bf1a0e35a SHA-1: 5816faff919aa7f45520acdca9408642c4c7e1a1 SHA-256: 0a1f999dd6d64d38ee9a6a640718cc77694a0175bcc2ae2d318ff8304df409cf
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious external URI. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links on disposable hosting suggests a link farm designed to obscure the true destination. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://xajibur.ru/strik?utm_term=can+high+blood+pressure+affect+pregnancy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388405/normal_5fc81b8b74c0f.pdfIn PDF document text
    • http://nojekufa.22web.org/temelaxuzajofo.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/jfstmU0/super_mario_3d_world_bowser_s_fury_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5fee11f96b535.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/eibkhai/passcode_lock_screen_bypass_android.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/fhg5Eao/57943083618.pdfIn PDF document text
    • https://cdn.sqhk.co/vopuvafamiw/SvbUjcj/nemegaxefegagiwazi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5fffb69c0db5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424400/normal_5fc896eaa1c0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc844e4-41a7-4aa6-9f10-ed76b5f08f84/medieval_2_total_war_game_of_thrones_mod_crash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ef4d7c-c9de-463e-a1d7-74afe9708f71/jibofasijovom.pdfIn PDF document text
    • http://nivajunupoz.epizy.com/challa_uri_song.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/47977290732.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/wexejokap.pdfIn PDF document text
    • http://zipodanej.rf.gd/combining_like_terms_video_8th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bdd213f-b1a1-4e0c-b390-020098fc6b85/nirixupexonuweworodokura.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/2006_honda_civic_si_coupe_hp.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/30791645885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec498e07-65a1-4882-812b-5dc77c37e54b/butefififiribobem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13400efc-7032-40a3-9311-d02d85509f82/nasen.pdfIn PDF document text
    • http://gafibis.epizy.com/1422511828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53c9d46-7204-422c-bcc2-8239468391c6/kulexaganikul.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_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 5564 bytes
SHA-256: 6c9dfe77ebea4e6fb90c470c0821a759b0179c7cd9489ff1d3ca151618bc6ce7
font_01_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 10828 bytes
SHA-256: aa1d9951e090af93cabf2c48411a18dcf25d738b1923352d5153d92a04865885

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