Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b459a841d642e8…

MALICIOUS

PDF

75.8 KB Created: 2021-03-01 10:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ba37cb6b77cc555ade071f66f675654a SHA-1: d18d786506788b3bf5071c4f02c10b1749893cf1 SHA-256: 09b459a841d642e8e85096a7019a51e8b7bb8fbae71eef542c5a010c9f9e8753
146 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://leonvi.ru/strik?utm_term=how+to+study+for+mn+permit+test PDF link annotation
    • http://bimolomazija.22web.org/17540977566.pdfIn PDF document text
    • http://gidpopiteru.com/kaththi_movie_utorrent_kickass1wuhw.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/FjbkjiL/london_tourist_guide_book.pdfIn PDF document text
    • http://dafilor.iblogger.org/77518861963.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/23325316516.pdfIn PDF document text
    • http://mebel-albero.ru/godzilla_king_of_the_monsters_horror_movies3iiep.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/jcgduEZ/farurobi.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/hlMjfJv/majubinewevuxinagilejobu.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/77365641087.pdfIn PDF document text
    • http://uscreditscore.info/290585389471wpe7.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/cPhfjhc/d_j_music_apps_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bezopebadutaz.rf.gd/employment_insurance_sick_benefits_application_form.pdfIn PDF document text
    • http://xefobimulekojuw.epizy.com/mumaboki.pdfIn PDF document text
    • http://tomogutirop.rf.gd/3d_desktop_wallpaper_animated_free.pdfIn PDF document text
    • http://rujemivegelap.epizy.com/time_analog_clock_worksheets.pdfIn PDF document text
    • http://zafaxomerav.epizy.com/kudewuxugoteso.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_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 5100 bytes
SHA-256: 56235db727a7d22ec6ad04e57c98db04385679e5d0eec036cf4fd7ff36698dd5
font_01_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 10740 bytes
SHA-256: 75f7e7a656d8f04a40434a43691c0031b17545b34bbf7e6231b1eae641c815ed

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