Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef9a38e9cdaed09…

MALICIOUS

PDF

67.6 KB Created: 2021-01-23 13:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 89433d8faf64c0aff740e7ccd7430442 SHA-1: 9f216027ca9023369ea1912a34aac9f0984f8ed0 SHA-256: 9ef9a38e9cdaed0960796e6c1286eabbd8886862a80858654c057728b370670c
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8224

Heuristics 4

  • 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
  • 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://jottigo.ru/aws?utm_term=catalogo+moviles+movistar+pdf PDF link annotation
    • https://site-1166704.mozfiles.com/files/1166704/12590310042.pdfIn PDF document text
    • https://site-1180442.mozfiles.com/files/1180442/airplane_movie_mpaa_rating.pdfIn PDF document text
    • https://site-1171969.mozfiles.com/files/1171969/12400571755.pdfIn PDF document text
    • https://site-1171500.mozfiles.com/files/1171500/yeezy_350_black_and_tan.pdfIn PDF document text
    • http://debakabuxaw.22web.org/mofubovade.pdfIn PDF document text
    • https://site-1177736.mozfiles.com/files/1177736/shoes_tied_together_hanging_meaning.pdfIn PDF document text
    • http://xazamobi.66ghz.com/ada_ramp_railing_guidelines.pdfIn PDF document text
    • https://site-1199955.mozfiles.com/files/1199955/47934915773.pdfIn PDF document text
    • https://site-1168045.mozfiles.com/files/1168045/club_car_carryall_1700_operators_manual.pdfIn PDF document text
    • https://site-1168081.mozfiles.com/files/1168081/9660557664.pdfIn PDF document text
    • https://site-1174552.mozfiles.com/files/1174552/attendance_app_android_studio.pdfIn PDF document text
    • https://site-1221949.mozfiles.com/files/1221949/babies_message_ringtone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/kifagejaxenobolozufafaj.pdfIn PDF document text
    • http://zetipetarot.rf.gd/duels_champions_pvp_fights_guide.pdfIn PDF document text
    • http://zulexesovo.epizy.com/islamic_economic_system_vs_capitalism.pdfIn PDF document text
    • http://pimorem.epizy.com/93679995774.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/rakejirisokider.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/audit_report_of_private_limited_company_2018.pdfIn PDF document text
    • http://vutakeba.epizy.com/cursive_writing_worksheets_ks1.pdfIn PDF document text
    • http://kegunujav.epizy.com/immovable_property_valuation_report_format.pdfIn 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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 5124 bytes
SHA-256: 5e0910c9048e0080193e6480a1b8cd87b491ea0a1b4ce4de5c77aed3c18d2e87
font_01_sfnt_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 11148 bytes
SHA-256: b41add5a8e9203b647c7662c4e03f2050353eabe2a6306aac54f6ca1d84c9118

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