Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c592f6f1290e7d5…

MALICIOUS

PDF

86.0 KB Created: 2021-03-14 16:35:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f358bdff5fc36c24f6e8aa6d9c640f21 SHA-1: 592489b133e39ff885a4c254f6066090fd1b7dd8 SHA-256: 4c592f6f1290e7d5d153152986d5e9e6bc2df2fc51e6add76c9a551115dcd779
156 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. 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 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.
  • 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://midufefew.ru/strik?utm_term=vicks+starry+night+cool+mist+humidifier+cleaning+instructions PDF link annotation
    • https://cdn.sqhk.co/fenazijeguk/ghicifs/sanigarulizudaxagebifa.pdfIn PDF document text
    • https://cdn.sqhk.co/nudofarus/VhhjhXj/76829333995.pdfIn PDF document text
    • https://cdn.sqhk.co/torixugajo/Hhgiezh/download_game_home_design_3d_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_600ad7b73e331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_60310c3ee43e2.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/wobuzisibal/java_hibernate_project.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/is_trading_worth_it_elite_dangerous.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/atualizar_android_da_tv_philco.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_8c748911d395428c93ac88f993dfdb25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisefowu/xatogivarifexijikisutuje.pdfIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_373a4b9b599546c992ba59b8617d48a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/bangalakshmi_lottery_result_today_4pm.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_3dc0e39dc7a64e1596158d025aacf74a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/pabegapimekopimifazuj.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/texefogeriwiz.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_30dd4bf0f46f4f7a9cc3bcc16e5bedd1.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_ae3861446152422aaae1e40febfc22a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/78610376917.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_off000111f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F3 5568 bytes
SHA-256: d4228ef26e9387079fdf6d0a86cc66955ad8cd750f9cdf94c2d9cabb3ecdd579
font_01_sfnt_off000124c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C8 10996 bytes
SHA-256: f70ee78433e2dab29f58367d3f123bf3d18f24834c0314afef1a52ec97d7cca4

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