Malicious PDF — malware analysis report

Static analysis result for SHA-256 661333301edc66da…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 03:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c89c14be7d959d0b528791d9cecf93b0 SHA-1: 562a31fad078b829494f37f91297d7cc6351b206 SHA-256: 661333301edc66daa7ffbed762d7d834596499aa573f21d88355b63693a7e8f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious lure.

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 https://medvor.ru/uplcv?utm_term=shivaji+the+boss+tamil+full+movie+online PDF link annotation
    • https://menu2uplus.com/images/file/zogifabunir.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/12697474032.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/xibupututaxaponetakup.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/96394673305.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/19165400201.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/29932332999.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/60305998847.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/dutivotikesapakivuvesa.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/guzavatejaberigidotiw.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/fogikogatowogesug.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/dutuv.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/37928743309.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/62572241577.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/tusakafo.pdfIn PDF document text
    • https://netpage.info/userfiles/file/48068366903.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/34001442191.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/75065912942.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/duwexusuzok.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d23135877---fogafanumezekuvorozevol.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/33639607145.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/nagojodewosobulijav.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109180654257337.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_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 17540 bytes
SHA-256: 425abcc2ed63733379cb78b9f2bfd95693cf0d591238c5a14170264cb04ecd88
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 10892 bytes
SHA-256: 3a593acc17f1afd1b4d6969ca64fb30b8e300ca41b2b92de64b1ea9d66f52168

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