Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c90dd24ed88913…

MALICIOUS

PDF

83.1 KB Created: 2021-03-23 19:41:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a49e04fdcd82f3ab4738b5b81c5c24c6 SHA-1: 808d089b5b275bf04e06382e7aff1390f2092920 SHA-256: 39c90dd24ed8891306c82de3380d509a97afdfb840a4a088c600a15eb8dd20fb
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 0.9996

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://xezojetit.ru/123?utm_term=powerpoint+templates+default+location PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5fefb2e023d89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_6058d1db85739.pdfIn PDF document text
    • http://tujidal.mypressonline.com/26191403494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_6020a50956e91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fc8a590f2295.pdfIn PDF document text
    • http://wojifos.22web.org/byousoku_5_centimeter_english_subtitle.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://s3.amazonaws.com/tarizirefevifab/sugupawadasopufaba.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/69983379418.pdfIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_db8e87fbf64d46d69a5a5b875ae0cd24.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_105e5274e3b04883aca65181e541eff9.pdf?index=trueIn PDF document text
    • http://xatosizukav.epizy.com/streaming_audio_recorder_full_apk.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_b957ecad86124e1fab9cb9b610903b1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf5ee42-e56e-4989-87a8-13d805fc1356/48462347503.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/accuracy_and_precision_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/47216313757.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_8bf53a9dffb046f28cac65ae496a9048.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/059530e3-69f0-439b-9206-b541d6a22751/jerry_kuhnhausen_shop_manual_vol.2_1911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc14af7d-4a49-4d80-a920-19fad2693e93/cazadores_de_sombras_pelicula_completa_en_espaol_online.pdfIn PDF document text
    • http://jivatufuwofed.rf.gd/beehive_english_book_class_9_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a345f9a7-493a-4106-afff-8cd709a54344/vulazapuperikebo.pdfIn PDF document text
    • http://zukeligo.rf.gd/farm_risk_assessment_template_uk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 5276 bytes
SHA-256: 5ef295236597fafea4fe77ecb0c694f5faaec01ea0ac5ed739b6565edf108340
font_01_sfnt_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 10980 bytes
SHA-256: f5d9c2b316dbfc858fa25f08d2bb11f710eb73e7e0b6a575d86c760f027d0f98
font_02_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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