Malicious PDF — malware analysis report

Static analysis result for SHA-256 90333af3bc5c2226…

MALICIOUS

PDF

77.2 KB Created: 2021-04-02 02:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e1687812e37a1d007ef3b439777314dd SHA-1: 6572b84e4e54c4eff5f1cead8d8e9b5f48188714 SHA-256: 90333af3bc5c222608d3b44416487b75fb4e40f7d0603b31597e1e0a462563d5
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, hosting numerous links to other PDF files on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and embedded URLs points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/award?keyword=difference+between+prebiotics+and+probiotics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424689/normal_600a26880324c.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/86293695614.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/QjigcRn/sonic_4_episode_2_hd_mod_apkpure.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/la_banalit_du_mal_hannah_arendt.pdfIn PDF document text
    • http://olivamebel.com/766734101847kh1r.pdfIn PDF document text
    • http://rafale.store/panasonic_tc-p50gt30_service_manualqjat7.pdfIn PDF document text
    • http://tixshopclub.space/connotation_worksheets_for_middle_school4ayhx.pdfIn PDF document text
    • http://neyroskakalka.site/totegazusuwutegana4r3q3.pdfIn PDF document text
    • http://tuwasukam.getenjoyment.net/logiciel_gratuit_pour_assembler.pdfIn PDF document text
    • http://f1l3download.site/72586900627u21y4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406785/normal_5fe66d3879075.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/nekefatevitidilexaduzofi.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/bFhbE3v/tunajor.pdfIn PDF document text
    • http://select-get.top/gidefazenej65vnc.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/thjVOhg/guess_the_movie_game_disney.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/can_you_play_2_player_on_mario_maker_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_5fd7b0813a162.pdfIn PDF document text
    • http://shoop-ff.ru/kuvasexa1wm4s.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/45230362749cx7pb.pdfIn PDF document text
    • http://emirofficialzm.com/digital_content_plan_template9q8s8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivikonalijuto.myartsonline.com/bouncing_check_law_philippines.pdfIn PDF document text
    • http://lamupimifuban.onlinewebshop.net/passiv_voice_englisch_bungen.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_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 5348 bytes
SHA-256: 8515d7b6b1c1b95ae2a9e27921f7435a01928bf3b2d60be5b94a485447c46064
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 9900 bytes
SHA-256: 54139135c347fa13c6c8b5be5a8f5489f493a6d8f273162db4670efbeb2aa84d

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