Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae527eab1846c7bc…

MALICIOUS

PDF

99.4 KB Created: 2021-02-26 20:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 42215720daeb97520e05b0620eb12799 SHA-1: 386387db8ce23b9e891cda210c505d1deb196deb SHA-256: ae527eab1846c7bc91d56592ce6d19aecdc389c9d23ffd591d1b571d405748d4
126 Risk Score

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 0.9998

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/strik?utm_term=publicacion+cancion+de+hielo+y+fuego+6 PDF link annotation
    • https://cdn.sqhk.co/xiteduva/hhfW1if/wevukanedutavivuxuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/7Cuhaie/unmatched_air_traffic_control_future_updates.pdfIn PDF document text
    • http://frut-tree.site/brookstone_wireless_headphones_pairingqi1wh.pdfIn PDF document text
    • http://hookup157.online/lujafixufififojizu2dv2.pdfIn PDF document text
    • http://iranomics.com/the_accountant_movie_download_in_hindibrij2.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/2hjNWF2/temporary_business_visitor_visa_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/gcFtTib/99762744177.pdfIn PDF document text
    • http://zoomita.space/accountability_significadohqqdo.pdfIn PDF document text
    • http://intekzafast.online/flannel_sheets_ll_beanvmgfu.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/gi40k7M/73871873358.pdfIn PDF document text
    • https://cdn.sqhk.co/gagufatemo/S6jbjg6/48359579124.pdfIn PDF document text
    • http://molotkov.site/juzebojerajuvugupx5cxf.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/tirimofufemukat/robepapus.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/arduino_beginning.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/29608558323.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/mrp_1xcs_chain_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/vupupaxodoxe.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_off000143a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A6 5408 bytes
SHA-256: c618b27db987b34d041d126ff6141cb2606e72402521a565b09f0a8da02be5e3
font_01_sfnt_off00015615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15615 12308 bytes
SHA-256: c9f0689494a63724d99d1115f306c5f74529f67264faf8cd0fa90c89a6381d29

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