Malicious PDF — malware analysis report

Static analysis result for SHA-256 75aa20519f449732…

MALICIOUS

PDF

80.7 KB Created: 2021-03-17 19:02:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cda46a89f03fdcc8fe93b95ce1732917 SHA-1: 2514e0036e125187490ab4e3cd13c25253af8c43 SHA-256: 75aa20519f4497323977542121ee6d364e1b2b3778be0fb840c5187f754b37d0
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious content hosted on external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=name+that+defense+mechanism+worksheet PDF link annotation
    • https://cdn.sqhk.co/rafopaluko/jJshfgd/72011418561.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/gh5jdxM/life_or_die_zombie_survival_pro_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492294/normal_5fdf57705010e.pdfIn PDF document text
    • http://bejisosubonito.sportsontheweb.net/jesus_to_a_child_george_michael_traduzione.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/g0Jvhav/wood_cnc_machine_for_sale_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490930/normal_5fc8196f5e27e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388280/normal_5ffce36294e40.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/ghhiab0/kisefuza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460457/normal_603890c9bd588.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/iaiaOid/42279463513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495271/normal_5ffbeeba3a448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418170/normal_5fe3f81f894be.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/ipmYFUW/jozofamikav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426812/normal_5fd761adc1a82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_60494d76e0835.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/fashion_design_books_download.pdfIn PDF document text
    • http://kusipanos.iblogger.org/83509170618.pdfIn PDF document text
    • https://cdn.sqhk.co/xifinelire/hojhh43/jumafediwegesixanewipozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wafezejub.epizy.com/definition_of_occupational_stress.pdfIn PDF document text
    • http://wofukisunoxo.epizy.com/steam_games_stopping.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/best_operating_systems_2020.pdfIn PDF document text
    • http://finofinaz.epizy.com/howls_moving_castle_song_piano_notes.pdfIn PDF document text
    • http://jipuzekas.rf.gd/meditation_rain_music.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_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 5356 bytes
SHA-256: eb1746c2e3132ad073422fba9d9b6fd7615a5945aaeae68b76d358cf70d6c679
font_01_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 11012 bytes
SHA-256: c7b439d71a6d8f203bb0657a2f08c820e81d7859ce85c4b2d2f168c5fcb4cfff