Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16afc6c48463129…

MALICIOUS

PDF

124.0 KB Created: 2021-04-01 19:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 781a3fb3d5f4f77c5dfddcce6a2d8bcc SHA-1: d83b46e8fbbd4fb5f2f2eed6d28c77a621165922 SHA-256: e16afc6c484631294261b950e4f05066f338bc1957813f2fb58c38033b092dbe
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-optimized and point to other PDF files, suggesting a link farm or content-spinning operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point to a campaign designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=calotropis+procera+vertus+pdf
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/eabe17d9de5e.pdf
    • https://cdn.sqhk.co/fusozuwalas/O5ianjj/plague_inc_evolved_fake_news_brutal.pdf
    • https://cdn.sqhk.co/kewebogi/gfibwje/learn_spanish_free_from_english.pdf
    • http://zaranes.getenjoyment.net/wetad.pdf
    • http://kakolamilasaru.medianewsonline.com/sabivavafoxopiporufuv.pdf
    • https://cdn.sqhk.co/tovisegag/iiixgfZ/sky_rocket_ii_roller_coaster.pdf
    • http://jefijunanupe.sportsontheweb.net/impact_of_biotechnology_in_agriculture.pdf
    • https://cdn.sqhk.co/bajowekununa/iwjeijt/new_simon_the_sorcerer_game.pdf
    • https://lotuvimipel.weebly.com/uploads/1/3/0/7/130739731/vilulejonudugozimo.pdf
    • https://cdn.sqhk.co/xujuvotu/sWibhcq/duzivenamovir.pdf
    • http://dizofuses.mypressonline.com/dojasizojunosemevivo.pdf
    • https://cdn.sqhk.co/bowewulaxam/gjbiehi/jokoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/fotepopunaj/clip_er_mp4.pdf
    • https://s3.amazonaws.com/niporofez/bidaai_serial_video_songs_free.pdf
    • https://s3.amazonaws.com/fadadedezeker/majixowiwigibe.pdf
    • http://tavamikilav.myartsonline.com/mapa_barcelona_ciudad_callejero.pdf
    • http://wovuluvoju.onlinewebshop.net/21309151096.pdf
    • https://s3.amazonaws.com/dazifozixawus/12887122474.pdf
    • http://diwavubodinaroj.myartsonline.com/how_to_unlock_i-pilot_remote.pdf
    • https://s3.amazonaws.com/sitok/how_should_i_layout_my_vegetable_garden.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_off0001962f.bin
7a6a21410a9290616afc09fb51da8186a3cee1ccbd70863b3d5f3249e243d9fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1962F 5116 bytes
font_01_sfnt_off0001a7a9.bin
de6edb141fd2e78c04ef0a3daa19501383bfb65e5ad6506d14e7273dccd4549a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7A9 14808 bytes
font_02_sfnt_off0001d5a1.bin
4b857861d09be52ac8f28370324a208a804b3084472ef10687a3473b8e30ec43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5A1 2744 bytes

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