Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f6c5affaacaf16…

MALICIOUS

PDF

66.4 KB Created: 2021-01-29 23:28:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 026e5a4be406d5a9f6607da87be4d459 SHA-1: 9bffd5a4b6b6e6dff8a9aa802ec85db1e8a86ff5 SHA-256: e4f6c5affaacaf1685e8b9260f78ae0478cd1594bafce168396a1d775dd9e3b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content, likely a phishing page or a malware download. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/wb?keyword=cops%20n%20robbers%20jailbreak PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446770/normal_5fe24e10591a1.pdfIn PDF document text
    • http://milansit.space/ridelakuvomokxib4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_600d71cde6305.pdfIn PDF document text
    • https://cdn.sqhk.co/toridezoxiko/kFhgfEa/romizugupen.pdfIn PDF document text
    • https://legutuxubumid.weebly.com/uploads/1/3/1/8/131872058/4685331.pdfIn PDF document text
    • http://myfoxing.online/salebufinakomabapobexakkkkm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371258/normal_5fd27d981568a.pdfIn PDF document text
    • http://taher-tcac.com/dynasty_warriors_9_ps4_gamej53e7.pdfIn PDF document text
    • http://herss.space/hell_divers_book_wikiwx5t3.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/dbcdf209090.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417675/normal_5fed243497e99.pdfIn PDF document text
    • https://lagizipat.weebly.com/uploads/1/3/2/6/132681030/gitirepufigofij-refelu-bubefaw.pdfIn PDF document text
    • http://dommasters.site/29243806133phm7i.pdfIn PDF document text
    • http://my-favshopc.online/bdo_derek_s_light_leather_shoes3haxp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_6005d6d5db0ec.pdfIn PDF document text
    • https://cdn.sqhk.co/bemapebe/aGe9Gjd/kerebuvipasideb.pdfIn PDF document text
    • https://cdn.sqhk.co/toxotunem/ifedFhi/81040985103.pdfIn PDF document text
    • https://kenafidoragakox.weebly.com/uploads/1/3/1/8/131856022/9702113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5ED 4996 bytes
SHA-256: be76714ac40584f1f142c23cee95a50b17e070852ade147715aaaba7438281cd
font_01_sfnt_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 11020 bytes
SHA-256: 685300d94bfcd8042ef8ceb32d2a38abfeadb662feebae27f34cfd9d3ade680a

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