Malicious PDF — malware analysis report

Static analysis result for SHA-256 2925fce102a0bc31…

MALICIOUS

PDF

71.7 KB Created: 2021-09-11 02:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 35511a4ec500e43d38172ca45d4c2b17 SHA-1: 09a29c6a6d25139bf84c9bdf32b7a443da3c75c3 SHA-256: 2925fce102a0bc31a49b25721e4ebaaae4c7f4d60576af97a131cfd3948ec79a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fainitelecommunication.com/public/editorfiles/file/niforulekuzuwopemad.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613195fb4ec08---93753853062.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/63501831368.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/89948671810.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/54238038734.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210901230103.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/juxetusejigopigon.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630669512bVQp.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/dafadovitamer.pdfIn PDF document text
    • https://coevent.ru/upload/files/medibutuzotutavurijidajut.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/11656084438.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/57379244087.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/fijuzatimigagunujuzuso.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/rojusowinodega.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/90333163196.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/jakibolurogunofoz.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/38600318586.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/nelirewenawikupamakarutaf.pdfIn PDF document text
    • https://tckontrola.hr/files/wuketa.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/17932734534.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/jasipiwibadod.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/81484173346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=my+talking+tom+candy+runPDF 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_off0000b601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB601 10712 bytes
SHA-256: e2c5aa0241ff73db881d02884fb873ce2cf653de7c16d150c8427c9d4707a54a
font_01_sfnt_off0000ce56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE56 16676 bytes
SHA-256: 3d4ee59c1ea94f9597ef26e7cb62e31e51873fa8e51e7ea5b5cb56b7c67d72f4
font_02_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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