Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71bf775a8d0f44a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 22:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adac65d5b78f6a36abc1d11127bcf4aa SHA-1: 4adf974557e631bf79e2e69a15385503a516d007 SHA-256: f71bf775a8d0f44a20cbdacdfa1bfe27d5372886ab89454c50bb5e7452e3d16e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://gazosilikatnn.ru/uploads/files/35997109929.pdf In PDF document text
    • http://koyomisushi.com/uploads/files/27116805701.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/faruzewoleduzejube.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/femolopo.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210922/2043256100.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/42123512952.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/xagakuj.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/wuboru.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109092006155911.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/21419463121.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/1224391715.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/45761054350.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/162090284.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/mepage.pdfIn PDF document text
    • https://ghnservizi.com/file/16688562920.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/28d35a60d0918a14599dd36bbf355134/74593482073.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/24919922545.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/xiwoxobuxaxezewokodi.pdfIn PDF document text
    • https://aneri12.cz/res/file/tadipekokix.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/80297215071.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/45726998308.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf2efd986a---novekesuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=online+pdf+editor+remove+watermarkPDF 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_off0000af83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF83 10760 bytes
SHA-256: 5abb6e84d4301c0a4b5bd67a6667c2d987deae9a622b1624781ccfc0ae0bb5fd
font_01_sfnt_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 17200 bytes
SHA-256: ab5b25f0939442bd057338122882394cd812db967c18546e8bea28fd735c586e

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