Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad312e02c40e0ea1…

MALICIOUS

PDF

76.4 KB Created: 2021-04-05 14:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05acf744d254443bcbe53e9663f4180f SHA-1: 2e70520d304b523db96756f167c094fdae025f7c SHA-256: ad312e02c40e0ea182f09e8a323bc6590cf41089efa9fdcd17ef2ea599cd86f3
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially malicious hosting, reinforcing the phishing or malware distribution intent.

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://jumiwimov.ru/award?keyword=prevencion+de+trastornos+alimenticios+en+adolescentes+pdf
    • http://kopuvimu.scienceontheweb.net/asus_router_rt-ac68u.pdf
    • http://nezowigivomi.scienceontheweb.net/antennas_and_wave_propagation_book.pdf
    • http://jabewes.medianewsonline.com/befilewomukezirapeduzep.pdf
    • http://biwiroxefamir.mywebcommunity.org/wufafiwod.pdf
    • https://cdn.sqhk.co/ximosufi/Lpjjggf/bafemaxofonar.pdf
    • http://depusapo.mypressonline.com/51258676466.pdf
    • http://zokidinodajives.getenjoyment.net/canon_mg3520_user_manual.pdf
    • http://kafujaguvo.mygamesonline.org/punctuation_quiz_with_answers.pdf
    • http://kifopelidito.mypressonline.com/how_to_connect_arc_to_receiver.pdf
    • http://venolilixe.mygamesonline.org/convert_to_word_online_for_free_upto_20mb.pdf
    • http://mikovil.mywebcommunity.org/19869163510.pdf
    • http://fagumawegoleleb.mypressonline.com/bram_stokers_dracula_movie_cast.pdf
    • https://cdn.sqhk.co/zelosoza/ibiakMa/emergency_evacuation_plan_map_template.pdf
    • http://fadulifakibul.medianewsonline.com/fakusuxenijun.pdf
    • http://tafiwon.mywebcommunity.org/the_8th_habit_from_effectiveness_to_greatness_summary.pdf
    • http://mobeditobaxul.scienceontheweb.net/letra_y_acordes_de_la_cancion_que_se_canse_de_llamar.pdf
    • http://bumumapa.mypressonline.com/apache_nifi_for_dummies_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://logiweliziweje.onlinewebshop.net/6670456194.pdf
    • http://dirazonun.myartsonline.com/dozetibudewirinuxonanuma.pdf
    • https://s3.amazonaws.com/jagux/ben_tennyson_alien_forms.pdf
    • https://s3.amazonaws.com/rilexazejuzovep/new_honda_rebel_300_price_in_india.pdf
    • http://rufapapufogap.onlinewebshop.net/explain_the_difference_between_intranet_and_extranet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea37.bin
80ce4a7e4527f35fce48985bb3bfdcab089ca8fbad10b18fc802477e4b40c7b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 5364 bytes
font_01_sfnt_off0000fc63.bin
0b2ef167cb01d13671608f25f993bb4cfceb6ba7dce15fd4be6cc989fae70ff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC63 11340 bytes

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