Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae58c3870ff2984…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 12:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 088f498d791d1920dbed9ce1797c2b78 SHA-1: d2d084d60c71b1303a483f95cbd9c7f0ec870846 SHA-256: aae58c3870ff2984b9bb89ec033a32e5c0a903b8640aac56c834e02e2232431f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for a large number of links, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://gongotour.com/FileData/ckfinder/files/20210918_71C0B371742DF669.pdf In PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/jopebilifatipe.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/8614874342.pdfIn PDF document text
    • https://semut73.com/contents/files/13017219761.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/zudaremurajokix.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/paxeka.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/wujezawukosaveka.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/48240710970.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/ginutodemokonozazej.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/xugumovogo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bb337e85abc5aa0340f78e9f32a82778/69909672385.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/wakisakigufawovup.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/85923788358.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/78586038798.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/lonegupalisasapa.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/sinekumigabimakewoj.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/77187699943.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/88309583936.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/mujaveregi.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404ddfbfdf3---velexulifizix.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/suvijatikepo.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/3764476352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=india+match+watch+onlinePDF 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_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 17604 bytes
SHA-256: 13bace345ef22ea954f8879de17e7138c85312ba31a26c96a8cc907c58cfe12c
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12099 10404 bytes
SHA-256: e746cda4f5b289467ad89613b2d67674692ce1e07eeea5bd2e266cf35801c5df