Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fba616d85b76fc6…

MALICIOUS

PDF

76.5 KB Created: 2021-03-11 11:17:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0f2316dcd169360bf8b8593cadba416c SHA-1: dae1b23749f2e1a08caa95947755ddbc717d2c69 SHA-256: 2fba616d85b76fc667a4daa63beabc17bcba281c5636d73585eb30e4f3f59b47
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://golowaki.ru/strik?utm_term=what+is+english+101+like+in+college PDF link annotation
    • https://cdn.sqhk.co/tokebamojos/LxicTja/pill_reminder_medication_alarm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_604224639d691.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370057/normal_5fc617bb669e1.pdfIn PDF document text
    • http://bluebadge-support.com/digi_002_console_firewireg2m8e.pdfIn PDF document text
    • https://cdn.sqhk.co/bitubebo/HjbK5bo/74831574828.pdfIn PDF document text
    • http://latuha.com/zuroberapenofuwfi0uj.pdfIn PDF document text
    • http://esportzmlevent.com/engineering_drawing_tutorial_ioe874ks.pdfIn PDF document text
    • http://kefojixesopu.66ghz.com/triangle_congruence_proofs_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491965/normal_5fee72fbe8fb2.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/gdlgKjg/learn_to_play_piano_app_free_download.pdfIn PDF document text
    • http://wunedefewadonif.22web.org/sadodorigewisakomosilukor.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/livongo_stock_forecast_cnnga53c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xewenofos.epizy.com/jibemevazaseze.pdfIn PDF document text
    • http://didavinevago.epizy.com/54924694456.pdfIn PDF document text
    • http://xitexeb.epizy.com/scary_stories_to_tell_in_the_dark_book_summary.pdfIn PDF document text
    • http://fopebuzab.epizy.com/neloxomukufema.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/geographic_information_system_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/59807379340.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_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 5236 bytes
SHA-256: ce837ce13b88f14d616b9db18aada6635a7b5f6cb51c68fd2859ca7d1ba28473
font_01_sfnt_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 10084 bytes
SHA-256: 4c3cc32fb5e06db3b316391e56413bdd607254a929a79a135ca674d86609100d