Malicious PDF — malware analysis report

Static analysis result for SHA-256 8329c24de0d5a5a2…

MALICIOUS

PDF

77.6 KB Created: 2021-03-04 06:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1da0e54faba1fcb0ebb675ec89ca3d36 SHA-1: 3ae73f6491b6f0ffa98979e9cb4dbc79d215c50b SHA-256: 8329c24de0d5a5a2d2d74b34b24b12cfaba22ee8820495dc38891b6a8938cf2b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or distribution point for malicious content. The presence of a 'download button' heuristic further supports the phishing or malware lure scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=types+of+brainstorming+in+reading+and+writing PDF link annotation
    • http://gedatidigog.sportsontheweb.net/puzedoxaxebuxemavetitom.pdfIn PDF document text
    • http://dostafood.xyz/pirates_of_the_caribbean_tow_game_mod_apk0kelq.pdfIn PDF document text
    • http://wapajag.22web.org/sam_adams_new_england_ipa_beer_advocate.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/gfqvCje/xugalilawinesojibor.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/engineering_thermodynamics_equations.pdfIn PDF document text
    • http://menazubuta.iblogger.org/net_framework_4._0_offline_installer.pdfIn PDF document text
    • http://es50off.pro/dragon_matte_liquid_lipstick_reviewtkd7r.pdfIn PDF document text
    • http://goodsun.space/prince_ali_sheet_musicqadoj.pdfIn PDF document text
    • http://xepidenad.scienceontheweb.net/agnus_dei_sheet_music.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/zanime.pdfIn PDF document text
    • http://tosatosekux.22web.org/gemuzedakosemedan.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/kovuzolivakugegipogudupot.pdfIn PDF document text
    • http://checkmyscore.info/kunilufoparovujulojasey3u9m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buwomir.epizy.com/toefl_writing_topic.pdfIn PDF document text
    • http://kedokonox.rf.gd/pazanepudivavaku.pdfIn PDF document text
    • http://livirava.atwebpages.com/bemubinizipurebo.pdfIn PDF document text
    • http://medexode.atwebpages.com/computer_hardware_definition_in_hindi.pdfIn PDF document text
    • http://zifasodokid.epizy.com/chowka_kannada_movie_full.pdfIn PDF document text
    • http://lovemogifad.epizy.com/spoken_english_online_classes_in_hyderabad.pdfIn PDF document text
    • http://dasutako.rf.gd/elkton_oregon_weather_report.pdfIn PDF document text
    • http://lawewil.atwebpages.com/viktor_frankl_books_list.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_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 5612 bytes
SHA-256: b1f3ec90348d4e17162ef6c22b91dae6a971dacc3ec8ab07e5ca29eb9916fd08
font_01_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 10096 bytes
SHA-256: 7535107ef8e153dcb690ad91a872f8567e6a9840c9c15f4057887dbbb4f83d54

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