Malicious PDF — malware analysis report

Static analysis result for SHA-256 db774e09274734cd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 03:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 825671b0a3c3f595b0b5b72098e5d9e9 SHA-1: 817cbb09a71107c8ec7abc5a687e575f7918f024 SHA-256: db774e09274734cd20d06c4cd3b037dac608f258311c1e2b2142a24ca2670a8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, pointing towards a link farm or SEO manipulation tactic. The embedded URLs, while many are unknown, contribute to the overall suspicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ace20af92---bilatukolezed.pdf In PDF document text
    • http://somkuthyoptika.hu/editor_up/wikukux.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/4541017377.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/tabelowin.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/91915094280.pdfIn PDF document text
    • http://elpijisystem.com/file/62374321324.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090716362973499.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/42464693999.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/wexegoz.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/dalifo.pdfIn PDF document text
    • https://preciseenergygroup.com/media/dasavoxixusina.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/bujusoju.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/zirakofabidusamosamazusa.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/ximudexugawowu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/gawudow.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/43259170777.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/tamurezovotipusipalusod.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/70405972755.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210904105246.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/48586750306.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/wonedekiza.pdfIn PDF document text
    • https://renault-service.com/userfiles/63150516010.pdfIn PDF document text
    • http://midel.me/userfiles/file/44786678630.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/41388557548.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/39255476416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+remove+vibration+in+keyboardPDF link annotation
    • 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_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 10684 bytes
SHA-256: 6ee504635d70d9e256822dd0ab05d90f2f35bce15bc2d393283728bdc37f76d1
font_01_sfnt_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 18348 bytes
SHA-256: 11a7f6e57ee8b7571d1f6e0e7b7e8d12f404cedbfec8d085ff8d1d58db93d248
font_02_sfnt_off000122ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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