Malicious PDF — malware analysis report

Static analysis result for SHA-256 0057a13159faaa3b…

MALICIOUS

PDF

86.3 KB Created: 2021-09-12 21:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d12ac48d7c4952c4d6f9370aa2d6310 SHA-1: 03c9b13bf4a181c2da3eebde7a265fa33365b6b6 SHA-256: 0057a13159faaa3bf2cf66bf4c72a1df7cb398b091aa6970f9d6cfbbca510abd
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs pointing to a large number of distinct domains, many of which appear to be disposable or used for link farming. This suggests an attempt to direct users to potentially malicious websites.

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://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6404a8cf9726681e5b9259b18fe0d8da/nonezubijenixako.pdf In PDF document text
    • http://saxonrt.hu/img/userfiles/files/63368451747.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210905045001.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/2326365924.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/58823133623.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/nuwaganenurinipidejonewa.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc70e44d37---vevaxunoraziw.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/rurawaniwajusuvip.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/taminozirujefuj.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/pufumofonurekagofevezufef.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/236554987.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/sowawavimuxerij.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/kogekum.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/96322856441.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/ed7ef4d341ae839d24bea44f7d4d57b0.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/nukoregolarelikaf.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36593539937.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210902201807.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/43602737729.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/27264392528.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/18755638125.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/30844551533.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/58354595021.pdfIn PDF document text
    • http://espokebar.com/uploads/files/57091667660.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/fexuvojekutejad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=which+sms+app+is+best+for+androidPDF 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_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 18056 bytes
SHA-256: 3da1894e3929ac2eb11ec473d0612f3d6b62bb6a9c93c20df005eb6be936f585
font_01_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F5 10972 bytes
SHA-256: 3d599a28d4eda4d503036157ab80452dc537fd01fd990b1ccd5e5f6a0343f9d7