Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b2db67416824b8…

MALICIOUS

PDF

100.1 KB Created: 2021-03-11 01:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a3ba3e4f725fb7afebccdf06dd4b40a SHA-1: 76d12d07b8270ea5a839d9c3be7086814ec1e14c SHA-256: 33b2db67416824b8342713540e5805faf1fa1506d7dcc36071d4325c8597b734
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=citizenship+in+the+world+merit+badge+worksheet
    • http://tepoparupomo.medianewsonline.com/arduino_uno_software_information.pdf
    • https://cdn.sqhk.co/pewowutefiw/cXha9jf/xepevafare.pdf
    • https://cdn.sqhk.co/livefivepa/digghia/neon_yellow_wallpaper_iphone.pdf
    • https://tujazewus.weebly.com/uploads/1/3/6/0/136028127/lakilobepofuvofuz.pdf
    • https://cdn.sqhk.co/zoluxoni/tMiiPhe/schema_electrique_interrupteur_double_direction.pdf
    • https://cdn.sqhk.co/nigalasiline/RifBjf4/potential_world_cup_cities_2026.pdf
    • http://tetiviguxawik.getenjoyment.net/jusijagawig.pdf
    • https://cdn.sqhk.co/burajugi/gjKBUhg/norufowirorikafopixiw.pdf
    • http://bikejesoxatelo.mygamesonline.org/list_of_stock_market_ticker_symbols.pdf
    • https://favexolifuluk.weebly.com/uploads/1/3/6/0/136092880/mivabopiju.pdf
    • http://gefosezidubajoz.scienceontheweb.net/nedebutisepijo.pdf
    • https://novomegaweg.weebly.com/uploads/1/3/4/7/134738931/wegusebababuxadilu.pdf
    • http://rumurel.mywebcommunity.org/smart_board_online_activities.pdf
    • http://gimatadokij.mygamesonline.org/grammar_practice_book_grade_4_harcourt.pdf
    • http://davupopebuwiser.sportsontheweb.net/honda_125cc_dirt_bike_top_speed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pewibim/performance_analysis_report_definition.pdf
    • https://s3.amazonaws.com/jemisajoda/business_newsletter_templates_microsoft_word.pdf
    • https://s3.amazonaws.com/libowebujakux/vedipa.pdf
    • https://s3.amazonaws.com/mixanaz/chaffoteaux_pigma_green_25.pdf
    • https://s3.amazonaws.com/jupudizadid/sarokojomezo.pdf
    • https://s3.amazonaws.com/dudurat/baldi_s_basics_game_question_3_answer.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012919.bin
33965ce490612653ff8c7d2cc08db9bc32ba853437925ed137967238b0bc2a0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 5624 bytes
font_01_sfnt_off00013c12.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C12 1800 bytes
font_02_sfnt_off000144a0.bin
1c0cdfaf051bf69ee0bb3e72ed39ecb13af89fa65f2ab42c52da3ead2537e564		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144A0 10904 bytes
font_03_sfnt_off000169f4.bin
ce874f2e085e8590e90e44fd0f1ad79a56b764a66e9b7cef068d1adcf4f4d1da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169F4 16512 bytes

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