Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf124b49bc2efcf7…

MALICIOUS

PDF

83.9 KB Created: 2021-04-06 20:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9764c71cfcfbe3cdad7778faa75d8b64 SHA-1: 74a98f1c8664a2aa911d5037efd9feae983f4dc5 SHA-256: cf124b49bc2efcf7fba5537e1d96a81a8159684120a99bb61b71443460e8c624
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 0.9998

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://kuzutuzo.ru/wix?keyword=bill+nye+plate+tectonics+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/zuxolusufa/Cjjghjd/gajomesototimavirise.pdfIn PDF document text
    • http://fixadazopirutus.22web.org/72103084612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_5fe66e3ad0c58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5ff2f2910789e.pdfIn PDF document text
    • http://lesanuzununefa.22web.org/dogiremenigatudikapumom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_602ea3fa9a957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_602865f76fd9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494146/normal_60363961b0e55.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/3jjOvzr/tuwago.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/HPigqii/33865150864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_604181cd3ea46.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/SCihyzc/xapeniletapimexinawavug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_b334c481d71a41d2ae1443f050315fb5.pdf?index=trueIn PDF document text
    • http://zejawira.rf.gd/agenesia_mulleriana.pdfIn PDF document text
    • http://pavebutom.epizy.com/sutakozuruwipibilanoras.pdfIn PDF document text
    • http://wixesazu.epizy.com/60131647980.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/modovemalat.pdfIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_7ab9ea16e72f498fa0abdafc4a72a842.pdf?index=trueIn PDF document text
    • http://gaxenomepelir.epizy.com/algebra_tiles_printable.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 5328 bytes
SHA-256: de4ef5bcb4eef4269faf5f53a76375d0bc3e9d5cbf2c1cc21eab9de4f4a2a936
font_01_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 11456 bytes
SHA-256: c60b61f1073de3e4eb60ca6eb81185d817327e31242cbf1aea8a2cea9ee85f56

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