Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57fdb7e11d78326…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 20:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5fe79deece21e719c92ddf7d1265558c SHA-1: 32da1604273b88f9491654319605955884e7c67a SHA-256: f57fdb7e11d78326e08de8ae24266f3bced7b51160f6fa7ab091a704fccf20ad
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document's primary purpose is to redirect users to potentially harmful websites. The authoring application 'wkhtmltopdf' is noted, but no scripts were extracted to further detail the execution flow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://drafthe.ru/uplcv?utm_term=android+registration+form+design+xml+code PDF link annotation
    • https://probidjp.com/ckfinder/userfiles/files/20210909_191252.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/nefer.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613759ba77660---7730428502.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109032237291744.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/80148476550.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/11163389273.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/xaxuxadibewafagevakevemib.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/79325050722.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/kanekanoj.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/91739558352.pdfIn PDF document text
    • http://fourfoods.com/images/files/venexopiv.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/75684019776.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/xizuvikofilosod.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/1428798752.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/baseji.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b577d967a---loniposo.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/45723347553.pdfIn PDF document text
    • http://sartor.ru/upload/files/21397906855.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/jukeladez.pdfIn PDF document text
    • https://oasis-travel.ro/files/34437789428.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/68301885169.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/47079481721.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_off0000ce8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 17948 bytes
SHA-256: de5c2131d6bad3939676fabb1ed5f0c80fc52dda931bd9aa42684c10eae9e852
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 10904 bytes
SHA-256: 43ac542dc690fe951f90ce65976798d543f2cbf10cfc4feb123ea78ff5231ae8
font_02_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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