Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc5a19d4096c215…

MALICIOUS

PDF

74.1 KB Created: 2021-02-17 00:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f30b576ba7d379ac9da9382e3752fe26 SHA-1: f455d05106777bd1ba3a63de54b449d26caba397 SHA-256: 4fc5a19d4096c2157b978bc50e0ffd0fc94252c55cf92e9ceb368c21acc37987
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/strik?utm_term=ejemplos+de+artes+pl%25C3%25A1sticas+para+ni%25C3%25B1os PDF link annotation
    • http://zanedasimitavo.22web.org/epf_withdrawal_form_31_status.pdfIn PDF document text
    • http://jekebes.iblogger.org/navy_hipaa_training_answers.pdfIn PDF document text
    • http://autoport76.online/6413961606b2mzx.pdfIn PDF document text
    • http://silver35.ru/jayco_greyhawk_owners_forum6ajmv.pdfIn PDF document text
    • http://radanews.site/89739925367nkywy.pdfIn PDF document text
    • http://mazers.fun/digalatesuwulabud2yg4.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxovugefulo/heatXaU/xosesafasakizesobesuwu.pdfIn PDF document text
    • http://findfreegirl.com/action_verb_sentences_worksheetn1d06.pdfIn PDF document text
    • http://kivedunorujuw.66ghz.com/2953126634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://patesosiw.epizy.com/mit_solid_state_physics_lecture_notes.pdfIn PDF document text
    • http://lojupodinitaxug.epizy.com/94755676873.pdfIn PDF document text
    • http://butadiviwev.rf.gd/seed_of_chucky_imdb_parents_guide.pdfIn PDF document text
    • http://wefugugis.epizy.com/36685873164.pdfIn PDF document text
    • http://tiroteta.rf.gd/95690313322.pdfIn PDF document text
    • http://saninov.epizy.com/bugugisabokapomoxuxe.pdfIn PDF document text
    • http://faduguxilanapeg.epizy.com/animal_worksheets_printable.pdfIn PDF document text
    • http://rananutoto.epizy.com/affair_new_punjabi_song_video.pdfIn PDF document text
    • http://tuwemipidepu.epizy.com/intracranial_aneurysm_nice_guidelines.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_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 5696 bytes
SHA-256: 657f2ffc7f88be9bb67f217512fc3a90b9ef798458826d65d247b11bf7d951c2
font_01_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 11320 bytes
SHA-256: fae6a2e57370064cd39977574b9ee870eb270752c30c2f494d40abe59e61f406

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