Malicious PDF — malware analysis report

Static analysis result for SHA-256 13325b21cecffe78…

MALICIOUS

PDF

129.1 KB Created: 2021-03-27 11:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d563997eb5da0ff9d8f2d8a648f030e1 SHA-1: abb376a2a238df345b5b0abd034699edd022513b SHA-256: 13325b21cecffe78cabe5f4d62723d1d0f4013f2e54f9ea909c2c06bac88a61f
194 Risk Score

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 0.9992

Heuristics 7

  • 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+install+imovie+9.0.9 PDF link annotation
    • http://rastet-malysh.ru/diagnostico_de_enfermeria_en_trombosis_venosa_profunda6e6q5.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/does_dreaming_mean_good_or_bad_sleep.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/1df14c1baf04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_6034cdbcdb705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487431/normal_601450784b2fa.pdfIn PDF document text
    • http://qwertyujg.xyz/calculator_vault_lock8zz65.pdfIn PDF document text
    • http://shoop-fl.ru/weather_forecast_lahore_tomorrow_hourlyrh8wl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494677/normal_60550a078fda8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_605407a96c4e4.pdfIn PDF document text
    • https://navikeput.weebly.com/uploads/1/3/4/7/134755574/xuwulezox.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/kazisiwuxevuban_pegirufeko_kuwawiluju_beludafuz.pdfIn PDF document text
    • https://bojuwidus.weebly.com/uploads/1/3/4/6/134698781/7974356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_6011f88228982.pdfIn PDF document text
    • http://xokijaxano.medianewsonline.com/dojilagazeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_60286fe978243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_604b6c18293ce.pdfIn PDF document text
    • http://newsportstechnology.ru/what_is_ideal_tax_to_gdp_ratio6fgy5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_600b1cbe699ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_601ccda9179ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_60288a555ebd6.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/defujo/febafu.pdfIn PDF document text
    • http://jujuletofu.onlinewebshop.net/73036789114.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/kugekufagikesajevosu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/74206808002.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/95681056781.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A89B 5176 bytes
SHA-256: e53ee584af7c180e5cb50606e311f75bcda974569ad2c9d55bfca1d247deea88
font_01_sfnt_off0001ba3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA3A 11224 bytes
SHA-256: fd2aec400731c12a45e27ef7d55a41784cc67b6d3417258eb9c053e0138eebd5
font_02_sfnt_off0001e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0D7 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd