Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a55d958dd9d1321…

MALICIOUS

PDF

141.0 KB Created: 2021-05-07 17:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 56e79eccd870359697eb948d2813dc17 SHA-1: 70b13ca94aa3c98c118f62571c9bd99c9d076542 SHA-256: 3a55d958dd9d1321be728af1a053840b481d8ff0440b87ca600b5d0f2f630617
186 Risk Score

Malware Insights

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

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 0.9993

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://fokemale.ru/strik?utm_term=bones+the+ghost+in+the+machine+cast PDF link annotation
    • https://cdn.sqhk.co/voravaxa/uH3muic/mobakogezuvupow.pdfIn PDF document text
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/gababez.pdfIn PDF document text
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/193201.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/10sqlid/anonymous_texting_app_android.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/taferimuwapo.pdfIn PDF document text
    • https://webapifupa.weebly.com/uploads/1/3/4/7/134706955/3076680.pdfIn PDF document text
    • http://butalinonoruma.scienceontheweb.net/ancient_greek_to_english_dictionary.pdfIn PDF document text
    • http://detonic-romania.website/volifetemeragerov48ixv.pdfIn PDF document text
    • http://mivibowefumar.iblogger.org/iso_13485_quality_management_system_template.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/pizaxojekonulavemixinumof.pdfIn PDF document text
    • http://dorightunion.com/stranded_deep_mac_freeesudt.pdfIn PDF document text
    • http://axecheat2.xyz/70353996398rpoem.pdfIn PDF document text
    • http://hdvideo.design/template_for_expenses_and_incomelqncn.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/9TB0hie/facebook_login_help.pdfIn PDF document text
    • http://baranaydin.org/can_a_wood_burning_stove_heat_the_whole_houseb7qx6.pdfIn PDF document text
    • https://xidujodoj.weebly.com/uploads/1/3/1/0/131071067/dadebozulavamit-jefoxu.pdfIn PDF document text
    • http://nefetenebubuwid.iblogger.org/nirupizumarusutuj.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/3634176.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02e0da19-eac5-4521-950b-4e410541bf1c.filesusr.com/ugd/516249_ccc2a5376f27477fb54afb274c68f605.pdf?index=trueIn PDF document text
    • http://kukelemut.epizy.com/remiwurinuxosarix.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_38980ac8eb4e4034967b262e0e6b812e.pdf?index=trueIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_590774a3826b4b2a8673fbc651cfa09b.pdf?index=trueIn PDF document text
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_b119d8b7ff514621b87b166ad62a77aa.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_off0001ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE2D 5136 bytes
SHA-256: 96816f319227022421ba26df560ac2136ee4918fc40e87c6a0a8826bea62e355
font_01_sfnt_off0001ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF86 11236 bytes
SHA-256: e75c6edb4473577f9bcbc0856b5817bf929975a835b4a94c9fd0bc8f517b8b65