Malicious PDF — malware analysis report

Static analysis result for SHA-256 903922d43f3daf6b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 01:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fb92d093fa07df92b5cfbeafcdba477 SHA-1: bee495ccad0aa3c2a28cb45450e58af214bb8b08 SHA-256: 903922d43f3daf6b2120feadcfb14207be3eb3dc3da24b572b8e2d1606bbd874
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external links, many pointing to PDF files on various domains, indicates a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://almavilag.hu/files/files/96500994763.pdf In PDF document text
    • http://gaziogluenerji.com/images_upload/files/87788262870.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/31284368658.pdfIn PDF document text
    • http://cx-gl.hu/images/files/xivumamutalilelav.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/53344922271.pdfIn PDF document text
    • http://skncn.com/u/files/lekokigunisitixufunez.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/xiwezimegevaketiraj.pdfIn PDF document text
    • http://contua.org/userfiles/file/11824890179.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/93174027970.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/2656704183.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/82141828586.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/72781919295.pdfIn PDF document text
    • http://airmon.hu/images/files/26164928832.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614235501f1be---lizufidomezoforaxesu.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/xikofinijotujoru.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/93278543432.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/12000333622.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/44282967772.pdfIn PDF document text
    • https://possamaiferramenta.it/uploads/file/21839191453.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/26968635283.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/xisuz.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/dowaporukuxij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=war+games+commander+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_off0000b809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01B 16568 bytes
SHA-256: ac647ddb9962e07400060e086ce431f8ef55fc045445e6e4999aad89889a3bc4
font_02_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 10704 bytes
SHA-256: 328b56b89a481b0c891622b7ea685fe756151c4c750c6fd97aab5211833c6f02

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