Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedb0e34de90315d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-10 17:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3cbcfbce0391041a619d10fa30a8605 SHA-1: 285d84eed553972c1bec4a0136c9fb6c0fb04451 SHA-256: cedb0e34de90315d7bc92cc2cba09296fbb6d0f39d4a648c4d0a0b6a3fc99a0f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. This suggests the primary purpose is to redirect users to potentially malicious websites, likely for phishing or scamming purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rusepress.com/uploads/wysiwyg/files/41986692465.pdf In PDF document text
    • http://vector-food.pl/userfiles/file/82377246345.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/23375478172.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/zadiwuxariluxekofexavix.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/filofanodib.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/1440a633ccce306bc73b1e200e17c9c9/rofimijorarifawipedebu.pdfIn PDF document text
    • http://imaginove.eu/data/Files/92039875907.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/64724410729.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/nixigavasunixidozam.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/pawesunugowemepaf.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/15769152116.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/renagerape.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/pefujazeladolosewafine.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/jatirejajobofizobuzej.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/juzozivipo.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/sYg7UHCfGtQ8.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/dujatasimo.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/26829969201.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/74448518277.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/bapobonoseto.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/38640256700.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/kuxaborokapelugebero.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb3c4f06d4---govipez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=neuromuscular+junction+diagramPDF 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_off0000beff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFF 16220 bytes
SHA-256: f2702b54a38528a7b6c3c70541b33aa73a2e2290013f0d3816a2313c2e785af2
font_01_sfnt_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 10920 bytes
SHA-256: d1ec8de896d2e211d786e0f87e41bd306155d8dcb8ca53c2bc2fa0648f0803b0

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