Malicious PDF — malware analysis report

Static analysis result for SHA-256 d128f8db27bb9b7c…

MALICIOUS

PDF

82.8 KB Created: 2021-10-14 07:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 06599175ade4a071de20814fb7466d9f SHA-1: 374d126543b3f1c60c4cb15b0d9611d7833cfe52 SHA-256: d128f8db27bb9b7c776e309bb3d7b7754513fe053c065166b6278b442d321d9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://trunglamdecor.com/uploads/userfiles/file/ruwomuf.pdf In PDF document text
    • http://stphilomenaonline.org/userfiles/file/35120325870.pdfIn PDF document text
    • https://el-tall.pl/pics/file/67272010656.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/mogurelude.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/kilodefurepum.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/tavudepebasutivabenoxap.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/xadupejikuleboxapato.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/wamegevizulizitul.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/85352516325.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/feresuterepufusopomebim.pdfIn PDF document text
    • http://retailcop.ca/files/98037052101.pdfIn PDF document text
    • http://imaginove.eu/data/Files/tesipiluxezedomikifanew.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/33114518865.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/zopagu.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/moxotunojuratesifatetiveb.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/jemitowigizenituni.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202110030307188713.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/muvolor.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f1ed1c1c2---95530614435.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/zedinoselilobuki.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/xipajatabovuzizo.pdfIn PDF document text
    • https://iword.de/userfiles/file/33038248696.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c51bd5d1f1---nuvukat.pdfIn PDF document text
    • http://newo.ru/files/files/zavoxovexovoselifejote.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/ladoxawoxoviretokajoze.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TxADE9PCSUw/uplcv?utm_term=rest+in+peace+grandfather+quotesPDF 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_off0000ddc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D2 17808 bytes
SHA-256: 205c29caf928c59f759dedd14a15ca6947fa1ced57742c824628d0d49c912b0a
font_02_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 11144 bytes
SHA-256: c95dd72f801e4930f7c39ffe519539277de333a470a90ffe6bfbe34e97fa5cef

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