Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40aef30db76c4ae…

MALICIOUS

PDF

98.3 KB Created: 2021-03-08 19:52:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bd937dd9da7faf1554db901a9c998c01 SHA-1: bd4f2ef5be966152be2183665f6e2d007d5dd78f SHA-256: c40aef30db76c4ae92b9cdf3782b4620740c468bf00cde940c90ad4590c39ccd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a significant number pointing to disposable hosting and utilizing UTM parameters, suggesting a phishing or SEO spam campaign. The PDF structure itself is minimal, primarily serving to host these links, indicating its role as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=what+is+ethical+decision+making+in+nursing PDF link annotation
    • https://gojanaribebiw.weebly.com/uploads/1/3/1/4/131437307/vemuxuzib.pdfIn PDF document text
    • https://mimedotaxejibi.weebly.com/uploads/1/3/0/8/130873786/2329880.pdfIn PDF document text
    • https://kemolarutu.weebly.com/uploads/1/3/4/6/134685450/9448730.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/hehciac/loverexikulenati.pdfIn PDF document text
    • http://stonersfranchise.com/employee_development_plan_template_pptcddwr.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/hhkKAij/leviathan_lab_escape_game.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/hWZu378/business_card_background_psd_free.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/66213447010.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/mefosuvukakedogowedo.pdfIn PDF document text
    • http://alcozerox.com/printable_calendar_september_2018zhs7p.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/gfgeMih/p3_tips_police.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/50120415003ohbu0.pdfIn PDF document text
    • http://item-get.top/imovie_tutorial_for_dummies439w4.pdfIn PDF document text
    • https://filafibiwi.weebly.com/uploads/1/3/4/3/134316544/f1dadb4409cef0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_aee789f03bc64cea8566366dc7532f80.pdf?index=trueIn PDF document text
    • http://tifilow.onlinewebshop.net/zoligakotojigivekenov.pdfIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_9b255b87fb034c11a6d4cf6ad8bf0de4.pdf?index=trueIn PDF document text
    • http://mevumum.epizy.com/are_re_manasa_song_free.pdfIn PDF document text
    • http://sudolurimav.epizy.com/29798267051.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_4b16a331c20b434f9de1294b1198560b.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_8294ec3f44df4f52b922688acaf71e31.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_off0001451d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451D 5432 bytes
SHA-256: 129f86dd9f934447994b6e4e15dee77622106d6a275b88da129b87638c0d8ed7
font_01_sfnt_off00015775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15775 10416 bytes
SHA-256: 597b1dba625dbf969cd45168de993d464dd78bb6bf4a5948e8af35f286e1584f