Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b663c4f6179603…

MALICIOUS

PDF

68.6 KB Created: 2021-09-17 01:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7acd9eb816523ffacc12e35ec28d9778 SHA-1: b611694763ec3d5d1e787018478b39a62750acca SHA-256: 80b663c4f6179603657cfc18b919f47aae3779fa3775643e9325337b485e6c24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm on disposable hosting, containing numerous embedded URLs pointing to various domains. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=movie+downloading+sites+for+android PDF link annotation
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ee740faa7b50b6c5d862b66956a0b6aa/83407570008.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/99188367713.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/15584550844.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/timuxulodunalono.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/bufijufugiti.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/53987250572.pdfIn PDF document text
    • https://n-tlg.com/files/file/80395695969.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210911_042658.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/91024816876.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/wefunitenukepe.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/rumikudalijovepafe.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buvus.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19f9cf82a---68002685336.pdfIn PDF document text
    • http://moneymaker-gold.de/files/sufokeligazoz.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/vuwudozijirorujavubupev.pdfIn PDF document text
    • https://svltv.in/userfiles/files/50902150818.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/30643795375.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/36642884540.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/waruxemobuxitilabivowip.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/sawavowoxonokutepiraluwo.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/34940370260.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gukuvolofit.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/tavufinofowekutomeluti.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/tajizew.pdfIn PDF document text
    • https://mmtours.si/uploads/48677696911.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://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_off0000b0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 14328 bytes
SHA-256: b92b3f9f6d9f32dbc10c71722b7009d67e952bbad182cf79da26360e005b4101
font_02_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 10672 bytes
SHA-256: 7c35ce23d1637f27a554dc442735614e6328900d21d9a87b4c2b3ff97917270a

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