Malicious PDF — malware analysis report

Static analysis result for SHA-256 2940490a54697a6f…

MALICIOUS

PDF

76.7 KB Created: 2021-01-30 20:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0941285809456d71470bdb7d11ba4eba SHA-1: 25df7180f29b89acad8a02b361248c3e76b08816 SHA-256: 2940490a54697a6f77e9298b4c5e3b4805932c62bb6d93b14cb5893bf7c4321a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-related, suggesting a link farm or redirection scheme. One prominent URL, 'https://jottigo.ru/wb?keyword=living%20room%20furniture%20sets%20cheap', is directly embedded and likely serves as a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wb?keyword=living%20room%20furniture%20sets%20cheap PDF link annotation
    • https://jajugodi.weebly.com/uploads/1/3/4/9/134902248/mudorixuvupebi-latuvu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368949/normal_5fc88d0308992.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/KXjfthg/cowboy_zombies_game.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/hhjirX3/air_hockey_challenge_mod_apk_unlimited_money.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486550/normal_5ffa14d48d5ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403271/normal_5fe4360646cef.pdfIn PDF document text
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/futaluf.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/rupubi-gipudu-dipogufefamobal-luliwefexepuzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468534/normal_5fe2291167740.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/jdqgihe/56036807448.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/goloditujebapaxufesunul.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/11478405675.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/rpg_character_sheet_designer.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/24028728452.pdfIn PDF document text
    • http://vofofoduwegakuv.rf.gd/baaghi_2_film_hd_video_3gp.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/high_school_reading_passages.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/xojisipazaxigufapepob.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/81836971175.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/audio_bongo_fleva_mpya_2018.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_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 5400 bytes
SHA-256: 9b3527fdb5a7666d03e06eb9c2efcbaa5be4e7cff3176186af55605e35da8092
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 11668 bytes
SHA-256: e8f0bafd689f6c113ac7367f90f16255f02daeea7942bd5927295c63b1fbc45c

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