Malicious PDF — malware analysis report

Static analysis result for SHA-256 1035df63f6d39f72…

MALICIOUS

PDF

85.7 KB Created: 2021-09-14 00:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41db1d5c57b58fa066e121f58bc3cecf SHA-1: 7509d2d5a5006969b5009074cdda9584ef4ed50e SHA-256: 1035df63f6d39f723a20b31e68e51ca5998718764b8183755daa1694ad104641
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/6675906039.pdf In PDF document text
    • http://clevio.biz/fckUpload/file/duxodalulanedanime.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/batuvatosovetoxazenoden.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/3450055312.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/89432411046.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/kopunus.pdfIn PDF document text
    • http://eternaseguros.net/files/files/paxuzitevuvo.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/wujepu.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/kakipowu.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/555984466.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/seworedevajutufimunuzix.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/natowuruxi.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/nexizoxivotogevasili.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/92817475396.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/3573455328.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/fikeloruv.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/43925631958.pdfIn PDF document text
    • https://capecoralliving.com/media/file/88814124445.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/76763439499.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161364a84c7ebe---53182078982.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/xaselivobofexinaratowoliz.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/dolajaseni.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/fopuru.pdfIn PDF document text
    • https://poker-fire.de/file/zovunitibisodimup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=1st+largest+countryPDF 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_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 18056 bytes
SHA-256: a6b9d3a534935f8016abd62a6375d45308c2ddeb225af7d5d188ef2723c9fe12
font_01_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F4 10480 bytes
SHA-256: 6176a29d76bc6325e0ceae2d41801d68ad58ccccc351076395f82628820fa21e