Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6722f5847c7cd85…

MALICIOUS

PDF

84.2 KB Created: 2021-03-09 12:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a2c6c03f1f2a4de922f2bd175f0783ed SHA-1: febfd5296b02ae8c4a6e8fcb469a2d25eb3bb4c9 SHA-256: b6722f5847c7cd85d90b78c0485daee6b69194c160fc9e0ebc282e43430c4515
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and the overall structure point towards a phishing lure disguised as document instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/strik?utm_term=brookstone+floating+message+alarm+clock+instructions PDF link annotation
    • https://cdn.sqhk.co/geroterunetu/INijZje/tidokol.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/1370026.pdfIn PDF document text
    • http://kafikiwamavo.22web.org/jasprit_bumrah_image.pdfIn PDF document text
    • https://cdn.sqhk.co/badimoweba/c3haJhc/birha_vijay_lal_yadav.pdfIn PDF document text
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/7248676.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/ighashj/boy_and_girl_cartoon_wallpaper_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/jggUSxs/paycell_den_baska_karta_para_gonderme.pdfIn PDF document text
    • http://vulefuxudonad.22web.org/automatic_teller_machine_seminar_report.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/gcEjeij/vavosokuzu.pdfIn PDF document text
    • https://widedopeb.weebly.com/uploads/1/3/5/9/135970132/ketata-lexubiwe-popomodevubogop.pdfIn PDF document text
    • http://revujutipisan.22web.org/black_panther_helmet_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigeladujonij.epizy.com/64918058574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb25d771-1235-41ab-af68-8d50385e7825/how_to_write_a_general_problem_statement.pdfIn PDF document text
    • http://xezogime.epizy.com/rugiwitusinubabo.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/android_studio_soft98.pdfIn PDF document text
    • http://maguvotu.rf.gd/39120553760.pdfIn PDF document text
    • http://bidexegope.epizy.com/hardest_harry_potter_quiz_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/technical_drawing_with_engineering_graphics_14th_edition_free_download.pdfIn PDF document text
    • http://rigemileluzed.epizy.com/40856863674.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/limedanefaxodukam.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/naruto_shippuden_watch_free_english_dubbed_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/nevadodomelezudet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c23e69b-ec90-4634-82f1-219ac6803906/mupanibajutewuzunerojiju.pdfIn PDF document text
    • http://rifepegagitajip.epizy.com/80298157975.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 5312 bytes
SHA-256: 59e28f0d720db6e48e4ff65c09b9e67695a889d5347d05e9099aebcb367ae6fb
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 11596 bytes
SHA-256: 4ca1e30d6e6e717c04e227ca5c909fd45813466779c95dc676d7d0aa3bc363b6
font_02_sfnt_off00012bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 16448 bytes
SHA-256: 3f7f6beb0f5865f83039c8434023d34048916fbab515aea8bfee4d6c7e3f3101