Malicious PDF — malware analysis report

Static analysis result for SHA-256 8728adce3fe43b51…

MALICIOUS

PDF

73.5 KB Created: 2021-03-20 16:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 33bf42d6ce0ff52e5ae2f6579871a077 SHA-1: ca9167aab3c96619c317fdef192df8b96cc61174 SHA-256: 8728adce3fe43b51b8b05e746ac283a981f0ebae261052b65e53d6a3ca2911c7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous external links, a common tactic for phishing or SEO link farming. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to drive traffic to various sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/award?keyword=tipos+de+cardioplegia+pdf PDF link annotation
    • https://cdn.sqhk.co/jonimaze/MHoifHR/fast_button_clicker_game.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/djdihMm/ponadob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_5ff95fe8b0393.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/icyOuKA/viredakaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_6027b3390c8d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404503/normal_5fd0461e71f9e.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/Oiigiid/45204779927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_60544d916890c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_de4af707e76540f3ba6ab97fec0a4aa6.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_a7f10f52fb5440a7b072f3f9800b08f1.pdf?index=trueIn PDF document text
    • http://bepenopivite.epizy.com/jabadakijanowanifugujir.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_060d7d1333194999bcafc7ab9a399346.pdf?index=trueIn PDF document text
    • http://rarifanep.epizy.com/tovapeneb.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_11ff6f08a7b3419493c1bbffef945f4e.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_eb8b508e0a5d426da4caa80e19eac548.pdf?index=trueIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_899af4c6ae6149a5b58634acd56eae36.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_e38ae75008354d879e32d5f13f6e8839.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_50929a838fac4180822e914074b1e08c.pdf?index=trueIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_5a68e9a651b94bc8aefde508ac123781.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_5bdd48166b64497fac85406ce3fb72c4.pdf?index=trueIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_28d47b2adb3943f88688dd3fbcc11ab7.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_b72f0e66e9a544509062b3373f3c8016.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_a3b0efc7956f4835912ba14f0466bad0.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31F 4872 bytes
SHA-256: 4e97ee1f30dd5452e649a44f90ee518e105a43f9eabce363ed86e4e81111a21f
font_01_sfnt_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 11328 bytes
SHA-256: 07fd50741a0b3a46030a59d5387e727f026d757e51f054c893f0f9908421a970
font_02_sfnt_off000108d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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