Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b40eec621f9fe5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-24 01:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45bf27c42d354cf1503ddeb5f649f754 SHA-1: dc2fea1af5c710c13ba12f6b75a283797cfb7fdf SHA-256: 59b40eec621f9fe5e5fcb6655f6c99ac50a8d0d1e8a0b132b36e14b61f2a7f8e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to other PDF files on suspicious or unknown domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://curry-box-deluxe.de/userfiles/file/zipigodixijojuramopoguja.pdf In PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/1234724668.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/lowitog.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/47040020173.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/reguzemiwororinamelobube.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/xuwel.pdfIn PDF document text
    • http://exim5.hu/_user/file/81191042865.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/85492183721.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/56695924283.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/8p0qru9u15sfnlrf3ulrt0e7jd/40502055619.pdfIn PDF document text
    • http://xfswchem.com/upload/files/48845244562.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/vuritakobugedasav.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614cec84cfb9c---955254133.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/bivasulumafexikanosaxoten.pdfIn PDF document text
    • https://okazionche.com/files/99085653533.pdfIn PDF document text
    • https://mmtours.si/uploads/541087281.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/kifopurejuvox.pdfIn PDF document text
    • http://hidramaco.com/files/files/71534875597.pdfIn PDF document text
    • http://rayanchem.com/d/files/luzamuzonewaguseji.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/fakajinanut.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/bobesovowogir.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/6703710719.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/xegisepadik.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/11791851345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sniper+elite+3+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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 10724 bytes
SHA-256: b388240f3e59f32f06697f3d1eae56d0146cf4eb3704cda54600e678306c24f0
font_01_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 18908 bytes
SHA-256: 1ffa36b44e845c68c90d6a85700cdc9378ff6cd3551f6372a487d98594cda7d1