Malicious PDF — malware analysis report

Static analysis result for SHA-256 35faeeeffb671676…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 18:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9622bd6de4ec71bbfffa9c755524d041 SHA-1: f6826a7dd30092354a3469a9761191436970dfa9 SHA-256: 35faeeeffb671676e2e47f21337eaebe0a6bcd81ea028353d2e975307f136b40
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. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a network of sites, likely for SEO poisoning or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.pattyn360.com/upload/forum/files/53652221314.pdf In PDF document text
    • https://stef-nancy.fr/upload/document/virijonukutevezupakewefi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e95ea0422d---saxuxugetejajogubimujo.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/71758865544.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/dabigamer.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/99397452129.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613804213533c---jasozilitewanasilokur.pdfIn PDF document text
    • https://digicpictures.com/downloads/xegumijebamerexezojulix.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/vupapip.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/43612317065.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/gigusuwexuxaxazufo.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/sirokufa.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/30689011262.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/64913922638.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/fumanoxusamekud.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/wugabusirexikozenazuzuja.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/nakuresewexexogatufogof.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/lixameso.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/67000434221.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/wajapuwujurazivinu.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109090409408718.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/65373453978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=windows+7+bootable+usb+tool+free+downloadPDF 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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 17724 bytes
SHA-256: ac7f66479385ce656b3a8902e1166727732ae51b8ec230379edeb6bbcdb45f42
font_01_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 10716 bytes
SHA-256: 204ab55bf952c0057188c1dece3e5c745fd4ca57bd4ac338e45aee8f40853dc3

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