Malicious PDF — malware analysis report

Static analysis result for SHA-256 33497a7629e64ddc…

MALICIOUS

PDF

74.2 KB Created: 2021-03-19 13:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65310ec9081131fbdf636e07566f4207 SHA-1: 2b4497491a3110e1e9c147257c9810507c6b231a SHA-256: 33497a7629e64ddc4864c505fa644ddb2a369b5afd7439d1c26c3be03dc882cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=kindred+audiobook+free+download PDF link annotation
    • http://novuzigekisev.iblogger.org/core_clinical_cases_questions_and_answers_in_medical_ethics.pdfIn PDF document text
    • http://ruwulepukapuk.iblogger.org/online_magazine_viewer.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/c0895.pdfIn PDF document text
    • https://rebodegumirimak.weebly.com/uploads/1/3/0/7/130775130/528276.pdfIn PDF document text
    • http://xuforixek.22web.org/sapufa.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/SF4ajd9/cosmos_possible_worlds_episode_1_watch_online_free.pdfIn PDF document text
    • https://melekutiruj.weebly.com/uploads/1/3/2/7/132740408/6732bd90e.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/dhdtpjj/21135556418.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/VhdbPih/infinity_war_ringtone_mp3_download.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/lesepe.pdfIn PDF document text
    • https://gidaxejopof.weebly.com/uploads/1/3/4/3/134305554/2066b5f27d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gasoxesa.rf.gd/xojomunobowetufurasukoj.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/nimemeg.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/gavugujukerotobuboj.pdfIn PDF document text
    • http://pajamenu.rf.gd/54012084681.pdfIn PDF document text
    • http://xemusiginusepiz.rf.gd/breaking_the_habit_of_being_yourself_joe_dispenza.pdfIn PDF document text
    • http://vaviweposaroku.rf.gd/asuran_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/75188444109.pdfIn PDF document text
    • http://semiwexojexudu.epizy.com/38354735517.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/dugibomavomudezav.pdfIn PDF document text
    • http://viwefar.rf.gd/minority_scholarship_form.pdfIn PDF document text
    • http://kinuzana.rf.gd/serapatanomuwosuwaz.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_off0000e506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 4988 bytes
SHA-256: a82391f9a109ee62e45fae996475571668b0bf002fa1a9e787123fedec92a3cf
font_01_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 10816 bytes
SHA-256: bd630a57abf0ff30cc554e367382cddddd90a47ac861f516d0cda579272b1616

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