Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4afbf3b4cbab70d…

MALICIOUS

PDF

84.4 KB Created: 2021-04-07 14:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3344d2fe81188763d9863d67e81f3c23 SHA-1: e9353ac16c01c407e98b3b167146350302f1d8fb SHA-256: e4afbf3b4cbab70d6aae95f51e344bc47c5f480549946a0ce9904309650c7d15
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://maypoin.ru/123?utm_term=bazel+cc_library+android PDF link annotation
    • https://cdn.sqhk.co/mapetidul/jhfhhgg/wonka_s_world_of_candy_match_3.pdfIn PDF document text
    • http://newyearshop.site/fojomumenajezisew1kgzw.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/UocKdzp/race_kings_obb_file_download.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/pSrA0a9/83037473410.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/h4gh1ib/laramajen.pdfIn PDF document text
    • http://kurs1.xyz/tournament_bracket_generatory691r.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/T3hgdWG/red_alert_2_mac_steam.pdfIn PDF document text
    • https://latufuxi.weebly.com/uploads/1/3/1/1/131163666/lakosukadosopa.pdfIn PDF document text
    • http://zarudofafibitov.mywebcommunity.org/33000720006.pdfIn PDF document text
    • http://summ-green.fun/que_es_taller_artesanal_definicionks2sq.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/43313158079.pdfIn PDF document text
    • http://spiritstudio.ru/rifikuvu9b18.pdfIn PDF document text
    • https://lolimoxozidexus.weebly.com/uploads/1/3/2/6/132682882/mobilesitolag-zenixoxap-nukoda-xapanixufu.pdfIn PDF document text
    • http://ninomut.sportsontheweb.net/absceso_perianal_pediatria.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/how_to_make_browsing_private_on_ipad.pdfIn PDF document text
    • https://gejiwafut.weebly.com/uploads/1/3/2/6/132683005/ralewutun_rupumug_guzurovajanede.pdfIn PDF document text
    • https://xofenozupe.weebly.com/uploads/1/3/4/5/134500057/fotibumeburisu.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/gQhgjjr/41759489802.pdfIn PDF document text
    • https://cdn.sqhk.co/razanifuwuz/g71icij/math_test_mathematics_practice_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/naketego/IiBidgg/mivesavixime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefilodeza.myartsonline.com/piano_beginners_songbook.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/bilorotowujelajasimekil.pdfIn PDF document text
    • http://bibezakomi.myartsonline.com/bearing_number_calculation.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_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 5124 bytes
SHA-256: 8ae0b17d159233c275efe527b5debb74d3c4084ee22cdf403e4779c9e6d7afcd
font_01_sfnt_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 11456 bytes
SHA-256: eb154cb96a80686b5f2e9e08a589184f4edc8b70001b9d18d2c3f6fb0ad58ff5