Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cdf7565b1c044e…

MALICIOUS

PDF

71.9 KB Created: 2021-01-20 23:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 0d7aa6aa475e1cf5f62e69cbb8ce240d SHA-1: 957850992c9feea5073a645a5494fbfdcbe58663 SHA-256: 21cdf7565b1c044ea7b44b0aec116fea55f0e9b30cc42604d3f88b8b86b25ddf
216 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://druttle.ru/wb?keyword=six%20cup%20ultimate%20beer%20pong%20rules PDF link annotation
    • https://cdn.sqhk.co/letijefa/iUrihCP/pizaburuxitivoletikupopej.pdfIn PDF document text
    • https://cdn.sqhk.co/doboketuzoj/Q1Xlhgf/32015409333.pdfIn PDF document text
    • https://site-1176856.mozfiles.com/files/1176856/rasojomajinowexaxuzugif.pdfIn PDF document text
    • https://site-1175981.mozfiles.com/files/1175981/guess_celebrity_faces.pdfIn PDF document text
    • https://site-1172843.mozfiles.com/files/1172843/arch_linux_wiki.pdfIn PDF document text
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/muxosena-zikose-mekume-finekofez.pdfIn PDF document text
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/4853690.pdfIn PDF document text
    • https://wewodagib.weebly.com/uploads/1/3/4/2/134266566/4294572.pdfIn PDF document text
    • https://site-1175399.mozfiles.com/files/1175399/94163133690.pdfIn PDF document text
    • https://xevowuzari.weebly.com/uploads/1/3/1/4/131437308/talop_fosenifu.pdfIn PDF document text
    • https://jamiwimavebu.weebly.com/uploads/1/3/1/4/131453695/1266564.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/figidireki/ihss_timesheet_hotline.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/vafudomirinove.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/90650249267.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/52779963915.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_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 5564 bytes
SHA-256: 7c652811566eee47f7ef3af6b82d53643d2fdf4ab377486de8e8ffe2a2952339
font_01_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 11408 bytes
SHA-256: 5ccbbec7af7c36c48f94ca8b4c3cd26e7110b1980fcd33dff42663088c017ab7

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