Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6a6d8a423d5c3b…

MALICIOUS

PDF

78.0 KB Created: 2021-03-30 07:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8c93ba0291b7e6932e3039ea5fae241d SHA-1: d225c6ce17540c56bdfeb1d063b90ecff36b1f40 SHA-256: 3b6a6d8a423d5c3b594c78e70f857824bc12fa73e05f83a4a836b2f441b9641c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=quantitative+genetics+pdf PDF link annotation
    • http://cardioactiveitalia.site/426632767324u9pn.pdfIn PDF document text
    • http://lowwsaw.xyz/merumeri1675.pdfIn PDF document text
    • http://youtube-subscribes.com/tojegigosefajoobk8q.pdfIn PDF document text
    • http://itfamily.info/watch_hamlet_full_movie_online_freec0iia.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/jeijKgh/kubulidesupexorapitotorev.pdfIn PDF document text
    • http://carins.info/death_note_ending_light_shinigami846og.pdfIn PDF document text
    • http://fesigemujelepir.66ghz.com/html_email_signature_template_mac_mail.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/Egfiisy/686996304.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_db4b070bc9d044f7bac93f92331e3724.pdf?index=trueIn PDF document text
    • http://zosonigileg.rf.gd/blank_apothecary_label_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b3e24e-e788-4dc7-b811-257f9e9cd158/tabela_salario_policia_federal_2020.pdfIn PDF document text
    • http://madotiz.rf.gd/geologic_time_scale.pdfIn PDF document text
    • https://2d66045e-c276-4037-81df-184b25840e97.filesusr.com/ugd/cdf3e3_e2d9cab09e6748adb8e1751dd24fc13a.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_029793ea1ef645aba7f89f32f40f6ad9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0834c845-e2dc-40e6-8bdf-7ca9946b927b/6106866768.pdfIn PDF document text
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_df3bd3f8761b4227b6606bbf631ac5d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f87c19-f17b-4784-90a9-1cb850b670db/76605746003.pdfIn PDF document text
    • http://dukutogesedu.epizy.com/half_baking_sheet_dimensions.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_6309b46a9a5e452681f4db8c90ecf7fa.pdf?index=trueIn 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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 5316 bytes
SHA-256: 7a27fe75a07923ac1bd9e8fcbf8f3ef51d15a57c39f41bdbbbf2f54a1cb9e8d2
font_01_sfnt_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 13456 bytes
SHA-256: 9b4c392e44e066cd72fc9008a6fd22209d351dc7d56b45083cd83f18abd046e1

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