Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9b55a488dfa295…

MALICIOUS

PDF

65.8 KB Created: 2021-02-28 16:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 20f0f324f1a2670f53324a2caabbb4b0 SHA-1: f2d05abb3af74dcc25de8c7861b9e6dbf0837555 SHA-256: fd9b55a488dfa295c2bbd6b0e021f2a05858b0469a756f2ad21f208a2a83c052
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=2013+evinrude+etec+25+hp+price PDF link annotation
    • https://cdn.sqhk.co/jukusenefow/pyNhiib/n7player_music_player_apk_download.pdfIn PDF document text
    • http://adanakebap.org/50863085681r8rw2.pdfIn PDF document text
    • http://a1metromovers.com/best_blues_radio_stations_onlinefzgyy.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/sUUhbjc/wolf_howls_at_night.pdfIn PDF document text
    • https://cdn.sqhk.co/xerolunem/phcSjfG/tenaxevopagiforivu.pdfIn PDF document text
    • http://stonersfranchise.com/chinua_achebe_civil_peacecvopx.pdfIn PDF document text
    • http://aydym.club/summers_heat_50-svl17_wood_burning_stove7tx56.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/hhDQULS/game_box_plus_400.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/QXhaVji/zupiburugatolewikinon.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/jeigfuU/hidden_valley_resort_gatlinburg.pdfIn PDF document text
    • http://gratoraama.space/harry_potter_5_full_movie_cast6otpr.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/79345770270.pdfIn PDF document text
    • http://qupieasy.online/champion_3100_watt_inverter_generator_reviewoqto0.pdfIn PDF document text
    • http://lovechat24.club/best_free_sound_enhancer_app_for_android5f0a7.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwisagilevi/Ajejdgg/less_screen_time_with_apple_watch.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/nilititonawafim/marvel_future_fight_reddit_beginners_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/90703535808.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/78927580789.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/churchill_downs_incorporated_annual_report.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_off0000c5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 5320 bytes
SHA-256: 5226d5c6c18f4d56c1fcb243bf4f65dcb68ff088e287724b56e3ed484b550fa9
font_01_sfnt_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 10092 bytes
SHA-256: 347c10099ec601f5a13f0b2d2bda2e5b2c8ee9426c875535a9b34cd1fd2cba6b

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