Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb42cf95a5ce9bc3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 15:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fcca5bca67c7dece3c534c7a065c725e SHA-1: 21ed36c6a9fabd5e92c2776af613b99d08d5cb2a SHA-256: cb42cf95a5ce9bc30837bf8022f3f53d85d715bd7a918efafc57b9d426c8612f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=find+trash+on+my+phone PDF link annotation
    • http://toanthinh.vn/webroot/img/files/nurorimekulojumigel.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/75210108817.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/xelonegakinizasimirez.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/31081559077.pdfIn PDF document text
    • https://coluer.ir/documents/file/zajugifasixakawegajo.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/fazujibiruzafevizodaze.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/gofageku.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/zivomamaja.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/nuxonugemotuwobuvo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408fca0689a---boxosavalib.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/xazavokor.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/87343c3e64101730f47ae2be6bd44b49/79805902721.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/bodajita.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/22876140968.pdfIn PDF document text
    • http://geose.ru/userfiles/file/66392632341.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/vunoz.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/fagowakemanamugipale.pdfIn PDF document text
    • http://prompol.com/media/file/57269982896.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/viduxotajikitidomodijim.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/35127565217.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/40583588504.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/39014779164.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210910102510.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/2979350318.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/gopode.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_off0000e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 17456 bytes
SHA-256: 267eb8e7388a9a79cd225a1d470bf3f35cd69f9d7fa6850a4adefae36b9aacef
font_02_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 10704 bytes
SHA-256: 1250ee327fd49095597c23b21fea0946d56f3b4ead59c0411b824f50411810fc

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