Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f423d16f17ea28…

MALICIOUS

PDF

77.6 KB Created: 2021-03-22 19:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 14263e63f6f77082b82c6ab819bba5a2 SHA-1: 77952358bddc7c9f0101917ac1f319f72df303da SHA-256: 11f423d16f17ea28113fef9c8b2bc151a23168ed05b22281ab50a3973fe7a710
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 link farm, with the primary URL being `https://soxebez.ru/strik?utm_term=what+do+5th+graders+need+to+know`. This heuristic, combined with ClamAV and ML classifier detections, strongly suggests a phishing or malicious content distribution scheme. The document body is heavily obfuscated and contains no discernible user-facing text, indicating its purpose is purely functional for the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://soxebez.ru/strik?utm_term=what+do+5th+graders+need+to+know PDF link annotation
    • https://mapivabivex.weebly.com/uploads/1/3/0/7/130776319/d74ec170d8d4dc.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/PuhfFjd/najarapewalokoguledo.pdfIn PDF document text
    • https://cdn.sqhk.co/torazanopuni/LvjijaW/dotokevopaxoj.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/ighdaht/christmas_carpet_runner_uk.pdfIn PDF document text
    • https://sesanejaw.weebly.com/uploads/1/3/1/4/131407178/6888484.pdfIn PDF document text
    • https://cdn.sqhk.co/zimalodepafo/8iaFWib/full_size_bed_sheet_set_with_comforter.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/hNo0jfu/60669601531.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/ehYFD3Y/weekend_at_bernies_2_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/Yyicihg/autonics_panel_meter.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/gi6wjc0/sewigemobosumilovama.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/yhdOfib/xosemakoru.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/fxhaBMa/horse_jumping_games_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/OgfiamB/toca_boca_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/hbhcjhS/infinite_flight_simulator_apk_google_play.pdfIn PDF document text
    • https://cdn.sqhk.co/deloreba/hehh8hc/8203972078.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/ofbMjgB/52135265139.pdfIn PDF document text
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/9d8c608.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetijesi/ji7gjwN/20_levels_of_code._org.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/5hgehbq/end_of_game_buzzer_sound_effect_app.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/jfigjjk/muviz_navbar_music_visualizer_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/90889990223.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/my_cloud_home_setup.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/adam_johnson_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/muzowa.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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 5348 bytes
SHA-256: 0f21368dd6c2c74b0f895b3dc32b508c697901f439232933781f19b60c21a8d6
font_01_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 10776 bytes
SHA-256: bb012eaaf36aee44a27b9a93d4eef400cfd5c7e83b1957dda00c9432ca99630e

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