Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f806b769edeaae4…

MALICIOUS

PDF

76.4 KB Created: 2021-02-21 12:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8ba4aee9a56b29892a2b3f7fce863eda SHA-1: 7e4dd69ce218f6782eaba86d604b59e2e1039aaa SHA-256: 8f806b769edeaae4d9d03b29c68a1651ef8f8d1f85df03f7380ef7c1b28a1e2a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation scheme. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs suggest a potential for redirecting users to phishing sites or downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wb?keyword=what%20is%20crp%20in%20blood%20test%20in%20tamil PDF link annotation
    • http://mynasert.online/965710461831el1g.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/iefxihb/spinning_gun_rack.pdfIn PDF document text
    • https://cdn.sqhk.co/naxudufejik/bFsDsjc/14539556452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408479/normal_5ffb5a8ae927c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413016/normal_5fcb6957d9fec.pdfIn PDF document text
    • https://nilijinaxobizag.weebly.com/uploads/1/3/4/3/134356504/64bbf.pdfIn PDF document text
    • https://nedidibizexoba.weebly.com/uploads/1/3/0/9/130969065/welaz.pdfIn PDF document text
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/zetapupekopigaduwolo.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/2780019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366346/normal_5fdf5a4cdf737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_602a4b792dcf9.pdfIn PDF document text
    • http://nufapivevavenak.22web.org/assassin_s_creed_odyssey_pc_settings_guide.pdfIn PDF document text
    • https://xegezegev.weebly.com/uploads/1/3/2/6/132683484/fomoxazudajeronibe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gesasodalunaka.epizy.com/stock_issuance_costs_balance_sheet.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_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 5468 bytes
SHA-256: 90cf293529ae837c184341dfb55c508fc3c3fdbd74dbfaaae4252226ba38678d
font_01_sfnt_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 10668 bytes
SHA-256: ec1be352942f6831b99e19fff845828ffadb348cf0dad1befa649dff6fe17f2c

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