Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0a9f5e6dc0888c…

MALICIOUS

PDF

80.7 KB Created: 2021-11-02 16:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 932933d6f89dc127d16b4a3689f811f7 SHA-1: a6fc5ff54c52c3a14beff0814bc69943a8baf6c7 SHA-256: de0a9f5e6dc0888c86bcdfffee580e3deaa11e69ad8273cfced7392441343f1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to external sites, indicating a likely attempt to redirect users to malicious content or phishing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm strategy, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hopadive.cz/ckfinder/userfiles/files/sigumoxilutupaz.pdf In PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/eb82e47fd19a86276a5215f3473c1ffe/89260454143.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/jasaxulogi.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/tevaguxazadewalavi.pdfIn PDF document text
    • http://air-ned.com/uploads/files/baxojujiluniboruvetupipu.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/febizenuxususari.pdfIn PDF document text
    • https://tmtteks.com/files/zemopedide.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/wapokufevebidujujuborafij.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/6982038471.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/44599285675.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/suzapexiki.pdfIn PDF document text
    • https://choosetop.e-giant.net/fkupload/files/mofipuj.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/20550507133.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363f09da6c5---guxaxowazojelewewo.pdfIn PDF document text
    • http://hoachattn.com/image/files/mugelatarebigokaz.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/tixavuloxugupususuna.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/46039016597.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pegilelodasidizut.pdfIn PDF document text
    • https://termofriz.rs/files/govasajexupi.pdfIn PDF document text
    • https://earthchallenge.be/sites/default/imageuser/file/73842304769.pdfIn PDF document text
    • http://ergakiland.ru/files/files/wazupefajewekuliwuni.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909022952.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/sixam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/5bhJmFgkeCE/uplcv?utm_term=what+does+jp+do+in+gta+vPDF 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_off0000d7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 10716 bytes
SHA-256: ef6f43e670eeef7d32732d74822e054a4655efd791ec5a0728728cc5a96b5dcf
font_02_sfnt_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 18180 bytes
SHA-256: 8f3da5c7a2dd917b90e44abaf5b9283553d4359f47c3934bbe3d1eed57c78b0d

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