Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa9313f17b796cd…

MALICIOUS

PDF

75.9 KB Created: 2021-03-24 01:34:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cd0977628bf56139e30aeb262d99412b SHA-1: b5260528dd2c961b1be2be883708d3aedb27fb14 SHA-256: 3fa9313f17b796cda6a6a575afbafe02a2d7a441a3bad98d52711bd094092b5e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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://jottigo.ru/strik?utm_term=mississippi+driving+exam+practice+test+virginia PDF link annotation
    • http://health-top.ru/48082021845u40mz.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/kagewabupizogikamew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_6043b51ca1ac3.pdfIn PDF document text
    • http://intekzafast.online/wisixixabemamuloxubekogiwywxre.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530429/normal_5ffc14ed09376.pdfIn PDF document text
    • http://eferevole.com/tumblr_page_viewercsk50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493881/normal_5fdd35eef0235.pdfIn PDF document text
    • http://rollernefritmassage.xyz/11367036085gnjlo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490129/normal_6001cf29c263d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445101/normal_600f77635ca28.pdfIn PDF document text
    • http://vixojejuzata.iblogger.org/simabufiratabizepawe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_601d677e51dd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_603700a2ddc68.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/bsa_camping_checklist.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_602830547563e.pdfIn PDF document text
    • http://baffer-shop.space/bom_radar_brisbane_64f0swy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_602ac3eea88dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakununul.epizy.com/4848102171.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/operations_management_book_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/47035988645.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/ocarina_of_time_3ds_strategy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/ti_84_plus_calculator_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/kalogax.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_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 5496 bytes
SHA-256: 66c5473f7a7ce5b08d83961917df80bb92b33ce7c28dea2743dd7e346f0a2002
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 10920 bytes
SHA-256: a8f1cc47a5e90215a2f195373960a6c73d2edcbc1417d0cfa809c7a458420cea

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