Malicious PDF — malware analysis report

Static analysis result for SHA-256 38adeefda02bc2a5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 23:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa20a691f03e7c3b75b3f5a66774cdbb SHA-1: 9ac0d7ccc0a1e23773855046022d4db38d085409 SHA-256: 38adeefda02bc2a5d7995b5b91b8d0256f9401889c5d4eeb256c37130975a0b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a link farm, with numerous external URIs pointing to other PDF files. While no scripts were directly extracted, the presence of embedded URIs and the nature of the link farm suggest an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inteko-tula.ru/f/file/vajevisojebusir.pdf In PDF document text
    • http://kraemer-duennebacke.de/files/file/marutubowulasumikomikekuz.pdfIn PDF document text
    • http://roocenter.ru/upload/file/51281974206.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/58289435506.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/nijejirulaviguxuxumonudik.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161382e5309112---64564466690.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1631024690.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/63936879532.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/43543397810.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/49111487365.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/zemexin.pdfIn PDF document text
    • http://vhktn.at/images/content/files/8222908330.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/xotonimesu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132ba114f914---17323919117.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/25027379910.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/nuzubapiv.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/22489775884.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/gepozu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/3158600305.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/xodigezifofuxufuz.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/8848000720.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/pilenosaxenemokatelokixaz.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/podusazakikofukotamug.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/natibuzudez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ninja+warrior+hack+mod+apkPDF 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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 10620 bytes
SHA-256: 8739f8074d63031a47e1e7408733d2fe9157619b918846ae3b725a390d6d8190
font_02_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 17244 bytes
SHA-256: 49bf91722af991275f5e0433193cdfd1ab958de07c56f3c39eb8016bdcc019ca