Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f29b7d6425db29…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 10:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 124dc02141dd1f07449ae98ab843494d SHA-1: 11b8a5139929997d66c30efb811fa77ef8126807 SHA-256: 40f29b7d6425db2976984ce18f6b9ad492b6fe958262fa2bd6da02ef0172ae31
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The primary URL suggests a lure for movie downloads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=a+quiet+place+2+full+movie+mp4+download PDF link annotation
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/94091444696.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210927080413-kozopasebadigemigit.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16329661369440.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109151947237611.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/tukezudusexajesopojiliwu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/cd7fe771a17d0da41b54ada3b03d3da1/ketosawina.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/791547311.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/ravogiwolosuxi.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/kegabewatapaletubetejubej.pdfIn PDF document text
    • https://ptogel2.com/contents/files/rulosurejopodixudo.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210925_8B1B8B57D12D720B.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/jamozediwezupepakojere.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/bamalaxizegifagekomaj.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/79574975015.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/suveme.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/nepirasavew.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/75389308148.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/texalojulewajojajuj.pdfIn PDF document text
    • https://bawauang.com/contents/files/vumotazanolikuzimobuzu.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/46608143550.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613035f145b59---90719849695.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/kikemawitufozupenup.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_off0000affa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFA 15192 bytes
SHA-256: aabc3eeec14ddce06e264f89f1f06f0b5879313abb976c1ed0e4b34a1317849b
font_01_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 11088 bytes
SHA-256: 5d23c57b6ce7cc963a14572e865522ebcbcff4bb2a3b94bb65a02ddac6da3b24
font_02_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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