Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2357b879a30040…

MALICIOUS

PDF

76.7 KB Created: 2021-10-06 04:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 35dbe61c99e89d24357b9c8c3a510478 SHA-1: c0ed80cd043d9ee0620eb043c587502a435d438e SHA-256: 5f2357b879a30040555dc8d25d5f5a43d37ad31573dafb853a0fec45c298373a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous suspicious links found, which is characteristic of phishing or malware distribution campaigns. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=crispin+and+the+cross+of+lead+summary PDF link annotation
    • http://nanopena.cz/upload/file/wumisigeleroxelexefefogiz.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/12989761046.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388a3f9f6a4---78904071268.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/72790562423.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/44345454075.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/powefebemodisisoludemosi.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/desura.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/xazudageroxisun.pdfIn PDF document text
    • http://njxinbell.com/upload/files/vemaxobijeb.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/17812809951.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/10831939749.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/4709907460.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/46493056154.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/ruxewusen.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/wabab.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/malomato.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/87154690758.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/nefesosokaxuterexojadivux.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/mulinine.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/wewuza.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/85350547035.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/76782303564.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/zadonizitakiw.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_off0000c76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 11132 bytes
SHA-256: 69b69d516e1eeec5c4be4c5a1c2f807431c6b3fb92e1675e8e6367f8f98aede8
font_02_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 17208 bytes
SHA-256: 0adb821d082ffb7b6586ff7645c60a4794834984b38d647afa80b9bd706d3dd2

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