Malicious PDF — malware analysis report

Static analysis result for SHA-256 c628edbc856613dc…

MALICIOUS

PDF

72.5 KB Created: 2021-05-02 08:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ffcadf9bc802d4c6c0f24d1e2a35ffd2 SHA-1: 8f97b3cc3b1b9e982c5cf6df0dfa8c42ecf693f6 SHA-256: c628edbc856613dc2df2b21e2b7b5998108572b94fc497ed05f0be316043c9b6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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=what+do+dogwood+trees+look+like+in+summer PDF link annotation
    • http://aduo5.online/can_i_do_a_liquid_diet_to_lose_weightp4w70.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/35000528093p8yh2.pdfIn PDF document text
    • http://lamovingcompany.com/fake_number_call_freetkidf.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/how_to_write_a_letter_of_recommendation_for_a_student_from_a_teacher.pdfIn PDF document text
    • http://shopyou.online/what_is_the_best_guitar_method_bookplx3k.pdfIn PDF document text
    • http://teaitalis.space/kebumidubakojixt7i5.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/16538459713.pdfIn PDF document text
    • http://djami.ru/159218682306pv3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5fd89f149bbd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484835/normal_5fefc6af7b728.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/50_tons_de_cinza_gratis.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_60340047d1409.pdfIn PDF document text
    • http://lilozekakotelup.sportsontheweb.net/jung_arquetipos_e_inconsciente_colectivo.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/wejuvono/corporate_governance_report_of_indian_companies.pdfIn PDF document text
    • http://nabafutig.myartsonline.com/99973586772.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/beresheet_spacecraft_tardigrades.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/buvutaterijexadipirovodu.pdfIn PDF document text
    • http://pevogikuxupeja.onlinewebshop.net/accelerated_solvent_extraction.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/matlab_plot3_axis.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_off0000de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 5408 bytes
SHA-256: 4f77af435cf0c6910269f613c9421f24f50778f547c29bb9515f77e828c20fef
font_01_sfnt_off0000f069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 10292 bytes
SHA-256: 6f17d19f1db393dc6f2694a8ecaf8fd41c6ec707ca534d678e0a65c506d3908c

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