Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f5c307f3074edf…

MALICIOUS

PDF

71.7 KB Created: 2021-09-21 03:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a232f8bf913e23fcf18d72742288320 SHA-1: 27660e54a1690f1c50bf0774a713c4149eda603e SHA-256: 10f5c307f3074edf87be947e866b2cc75c849db252dbd54512d72a797d3f9e18
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that triggers an external URI redirection. This behavior, combined with ClamAV detection and ML classification, strongly suggests a malicious intent, likely phishing or malware delivery. The sample leverages multiple disposable domains for hosting PDF files, indicating a link farm or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=unsw+taste+of+research PDF link annotation
    • https://home-consult.lu/userfiles/files/zenixeniviban.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210917092854.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///texekuxexesul.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/26311033871.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b253babc3e---rekega.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/dixupawukupukonofenuro.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/73517909862.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/61692236140.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/nifenimidebesojufoj.pdfIn PDF document text
    • https://drlanda.hu/user/file/xuvimawi.pdfIn PDF document text
    • http://sergeybazarov.ru/file/xifapote.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/32770327819.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/ridumipepa.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/47590553382.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/sebik.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/dibepufugumumefudoraka.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/balifanovuxopipokafej.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/96997532035.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/27035803145.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/razejoneg.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/sojudirivudufadikasokanej.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25bd3a9e7---tuvojelerebiwelaxiwuja.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/pitebudaretugugowogupofar.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_off0000b663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB663 16932 bytes
SHA-256: 7cacb25ebfc6839cf2e0b92b3d1956a70eb86a4c350e37ecf8b543b4c2c45ecd
font_01_sfnt_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 10388 bytes
SHA-256: 2234e0438f302631b07ed9258264bb68e982f7376b1526aff698bfb3d02031a7
font_02_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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