Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf79bcb07590d0a…

MALICIOUS

PDF

73.2 KB Created: 2021-02-25 09:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c5d1a7d14e733e93583cb79bab305c7b SHA-1: 052814264bae64f23099547a88b524ad0e9b283a SHA-256: faf79bcb07590d0a147dda34ee7bcaf16b2bf4559946f92b2a4edc62240a1d66
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, likely to distribute malware or conduct phishing. The embedded URL points to a domain associated with potentially malicious activity, further supporting this assessment.

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://bologen.ru/award?keyword=how+to+use+a+char+broil+h2o+smoker PDF link annotation
    • http://ses-paypal.com/husqvarna_sewing_machine_double_needlej2j9r.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/9510839454dobck.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/11077463470.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/ughUgj0/vuliwetodogo.pdfIn PDF document text
    • https://cdn.sqhk.co/maweveju/dgephgU/16587946358.pdfIn PDF document text
    • http://vereffka.xyz/49776190812z4o1s.pdfIn PDF document text
    • https://cdn.sqhk.co/lazodadevab/iePRhcO/ding_dong_hostess_ingredients.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/what_did_the_government_do_to_help_the_great_depression.pdfIn PDF document text
    • http://good-production16.site/38218618308kemkl.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/how_do_you_update_your_tomtom_for_free.pdfIn PDF document text
    • http://mikrotikwizard.com/anemia_falciforme_acido_glutamico_por_valinax0y35.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/wokesabisevo/67222381238.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/83480559360.pdfIn PDF document text
    • http://gafodix.myartsonline.com/how_to_give_a_compelling_interview_presentation.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/assateague_surf_report_tomorrow.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/10973239425.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/how_much_does_a_small_square_bale_of_straw_weigh.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_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 5428 bytes
SHA-256: 6dde3c48155b65e628a059da39517a0254e460351c7e5824ca5cc0c9d0ff89c1
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 10564 bytes
SHA-256: cf9e9e1131080d37a898087563c7cd9af2f323bf6b2202d663e21c671c793c06

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