Malicious PDF — malware analysis report

Static analysis result for SHA-256 78601694a22805ec…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 04:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 379d83dfe30d8c561a1225ad5890785f SHA-1: 4516a67717e8d274499de0a5c7cb91d3989ac181 SHA-256: 78601694a22805eca286c1bc47ad9ac4f854b3a4b8ace3e0066e29fc7b6ab640
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fastbeatbattlerider.saint-fun.com/assets/upload/files/wosevapajamabapadivox.pdf In PDF document text
    • http://kerekagy.hu/UserFiles/file/94393742288.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29a0cb2abeb66dc86686b48fb702d0a4/20521857880.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/24451559632.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/10604406679.pdfIn PDF document text
    • https://aneri12.eu/res/file/84854073926.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/26004692867.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210907_141441.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/80750242905.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/22721062916.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/51199416619.pdfIn PDF document text
    • https://85097781.com/upload/files/razozabolaf.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/wawubul.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/nutid.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/zegilap.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7a05a276---57686930263.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/dememolubuzelo.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/70074375156.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/vufiralexajo.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/72418515403.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/88700616125.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/kudadekisazuximube.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/65973299412.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/wamesezez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+horror+story+games+pcPDF 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_off0000b298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAF 10744 bytes
SHA-256: e95649015c7dcb81ecec1654a20083ba8d9d08d75309f2092e001325d3d7b2c0
font_02_sfnt_off0000e38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38B 16212 bytes
SHA-256: 81cf2ab92e65840714544985a4c4d2bb0d497c585abfb385be96b06deeb593ad

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