Malicious PDF — malware analysis report

Static analysis result for SHA-256 9775560cf7288661…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 17:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a401b191d84f380daf92c87497e12d8 SHA-1: db6afd6395e554125ac8d7c46ac8d91ebe4cb9a2 SHA-256: 9775560cf72886615a750d15dd909f124979adfdf13c615ca244eef17729892d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files on suspicious domains, suggesting a phishing or malware distribution scheme. The presence of a 'utm_term_redirector' and a high number of distinct hosts further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://kowalstwwo.pl/public/cms/images/file/6647510834.pdf In PDF document text
    • https://actaviaserica.org/board/file/files/18302093404.pdfIn PDF document text
    • http://etre-belle.su/images/file/kogijurabadisidexo.pdfIn PDF document text
    • http://entrackintl.com/uploads/pakepugitegesejazofegupox.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/36057431318.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/mutexebuk.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/71418217707.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/85447985944.pdfIn PDF document text
    • https://aashianarealty.com/file/rojevevivotafabaru.pdfIn PDF document text
    • http://rabudiagnostic.com/userfiles/files/xukoka.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/76205151496.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/wimov.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614040956f04b---2345007628.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/kinovovisuza.pdfIn PDF document text
    • http://bulmarconsult.com/files/38900181363.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/87963618669.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/faxekukoliridemole.pdfIn PDF document text
    • https://tessuno.com/upload/files/61320c02a3e7e.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/53977882421.pdfIn PDF document text
    • http://carszana.com/image/upload/File/tupabururotuzu.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/94165231303.pdfIn PDF document text
    • http://rinsacars.com/files/others/33240512242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=birds+of+prey+full+movie+123PDF 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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 10972 bytes
SHA-256: d42e22e504cdacf217376d5820faa41a856f82fb7aac3128de0b2950eb3ef713
font_02_sfnt_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 14812 bytes
SHA-256: 1b242f7bd0c370bfd5b6da98f51ea842549a115c5fe39a886047be4386c225e6

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