Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed148d18d2ff7c9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 20:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc3c0ca680de2590e2ecae18cb3fcabc SHA-1: f95c962c4494eca893b127007ff2d37087a6319c SHA-256: fed148d18d2ff7c99606b5f0725d4b355da8d68219e3c5301a0dca715e762b9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://allytemp.ru/uplcv?utm_term=tubemate+free+download+app PDF link annotation
    • https://hongmao.tw/uploads/files/202109070056368027.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/9168700658.pdfIn PDF document text
    • https://phuquiland.com/upload/files/jomevodefumusifuzuti.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/giwogoxiziw.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/nigagamikefen.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/gapezefuzenogulepaj.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/40749539926.pdfIn PDF document text
    • http://sinoorchids.com/image/file/36056623479.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/botutaxajebaxotuzesawa.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebewutudogiwupariwixu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134321cca198---selorebofazono.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/pixokogugutezuw.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/wiwamiposadexaxomuje.pdfIn PDF document text
    • http://cabini.it/userfiles/files/47267325858.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/gizetavadirarawegoxug.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/56610353258.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/rixuse.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/80046258491.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_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 17364 bytes
SHA-256: d0eae87b0720f76d873cb77d6fa29c182f74e0b8872138a2a6a197569915d892
font_01_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 10688 bytes
SHA-256: 06104a21052da5b7bc1e8deccf90ff762ca182d1ff12c839575a26b6a74771d7

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