Malicious PDF — malware analysis report

Static analysis result for SHA-256 91665010a406d168…

MALICIOUS

PDF

105.0 KB Created: 2021-04-07 10:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c493bfaa16056bd7bfcb68b489cf1adf SHA-1: 52e9e6747c38c448233aa3c19803813218057d57 SHA-256: 91665010a406d168af66ef0a43d6b55465b52f3aae14584138808bf2e51ae66a
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://jacksth.ru/wix?keyword=samsung+6201+manual PDF link annotation
    • http://gezetola.scienceontheweb.net/vikoxopekelebomaxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_145d83e291a8451797febe3a13ece631.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/84969721058.pdfIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_8faef78541604651a1260b85aa999218.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesotat/javascript_stop_form_submit_button.pdfIn PDF document text
    • http://zakexukosogu.atwebpages.com/sweetbitter_stephanie_danler_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/just_2_words_level_1096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a74b82-c10d-425d-a0f8-cf65485b2735/selenium_c_tools_qa.pdfIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_9dde077879a04e83a87886d422057616.pdf?index=trueIn PDF document text
    • https://cbf60184-924b-4e65-abc2-244eb733ec12.filesusr.com/ugd/9a25f9_4d5f26e3bb474f7fb400efcd210249b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinezedu/66415018057.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/terapia_cognitivo_conductual_para_nios_con_tea.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/27194077129.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/vefinavogukugesejeda.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/advanced_trainer_second_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/bojefejemomoxisodam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1386d995-4769-41ab-b3e0-289e730a7bf5/zone_of_proximal_development_and_scaffolding_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ff76a6-24b2-42e7-82f0-4734d9377727/60806661326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/849151ff-82c4-4b74-b038-7ec1699af914/wamazufenafigapiza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F94 5492 bytes
SHA-256: 8473b730b09096ed51b679b2820cfc4e443ed5ccf41699bdb24becb9689d1054
font_01_sfnt_off0001622b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1622B 1936 bytes
SHA-256: 246569b5fd7226bd0ebf3c016de7ba0bf82e996896d660a08030b2af0a08efd3
font_02_sfnt_off00016b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B6C 12600 bytes
SHA-256: 45ef3ac5efb01b779a143147389d8393e9574d4566bdadbe68e8847813c5865e

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