Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9cafed00b58f1b…

MALICIOUS

PDF

81.6 KB Created: 2021-03-22 20:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0a8355fa715ccb4c6bad9c3e1db00e9 SHA-1: 671d1eb04b23d709d4a5691c5ded8a47932ecf53 SHA-256: 8c9cafed00b58f1b2e3b170dff49a1c8221008b0fea157949494536b70ee26b2
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a site with a query parameter suggesting it's related to 'informed consent form template for clinical studies'. Heuristics indicate this PDF is part of a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=informed+consent+form+template+for+clinical+studies
    • https://cdn-cms.f-static.net/uploads/4420617/normal_602e5559d8615.pdf
    • https://static.s123-cdn-static.com/uploads/4484631/normal_5fffa323aa442.pdf
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/868955.pdf
    • http://wowezixuxaxu.22web.org/how_to_reset_panasonic_split_air_conditioner.pdf
    • http://tobepotalesozaj.22web.org/aankh_marey_new_song_pagalworld._com.pdf
    • https://cdn.sqhk.co/puburikob/eihhhep/kiki_delivery_service_cosplay_by_lanei_bad_habit.pdf
    • https://lezanaxowap.weebly.com/uploads/1/3/2/6/132696506/lofujutunidawekorana.pdf
    • http://gosofimasuwemig.iblogger.org/7521376422.pdf
    • http://fupefabesosada.mygamesonline.org/best_rotisserie_for_weber_genesis_ii.pdf
    • http://golesaluwo.66ghz.com/bengali_album_song_video_hd.pdf
    • https://cdn.sqhk.co/jawuraxexije/Ogf3Qjh/20344696580.pdf
    • http://lonotel.mygamesonline.org/tezusupew.pdf
    • https://cdn.sqhk.co/josipinu/hxhbhh3/79210308985.pdf
    • https://poduxerot.weebly.com/uploads/1/3/0/7/130776630/zejiwobe_pojume.pdf
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/7095142.pdf
    • https://cdn.sqhk.co/pibepufas/jhqhh3g/99704339880.pdf
    • https://cdn-cms.f-static.net/uploads/4419857/normal_60366312b74b7.pdf
    • http://segaruzobuguses.scienceontheweb.net/sarareraxa.pdf
    • https://cdn-cms.f-static.net/uploads/4445573/normal_603f69b7c04eb.pdf
    • https://jinuvavuvebox.weebly.com/uploads/1/3/4/6/134612635/6478103.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kewevagisugimuw.onlinewebshop.net/first_world_war_in_tamil_download.pdf
    • http://wadumoseri.rf.gd/dabujomatapexesoruzi.pdf
    • http://marobow.epizy.com/reportable_incident_osha.pdf
    • http://sufutogikid.rf.gd/rebebuvas.pdf
    • http://dolasuwukino.epizy.com/abhinetri_2_full_movie_telugu_movierulz.pdf
    • http://kexeban.rf.gd/wotuxogusabeb.pdf
    • http://bikukasosisado.epizy.com/malayalam_tv_channel_apps_free.pdf
    • http://ziwivazud.onlinewebshop.net/onkyo_tx-nr636_manual_advanced.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_off0000f323.bin
27b4b5c55d57a1c7279d42bcd319f05bdfb50355866fae71d350e5ce831718cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 5120 bytes
font_01_sfnt_off00010466.bin
88593af8c5d7cca7d250cc80d5f8e2d1701c579a3005108087f54de5df997324		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 10952 bytes
font_02_sfnt_off00012985.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12985 4324 bytes

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