Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7fa16e1758d637…

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 04:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47e245f315ac88b34005200c60af78e8 SHA-1: eea167fe72b39d21155e0e0842c7f3ea3c15905c SHA-256: 0f7fa16e1758d637830292ee20b9f20d01d6277aabb9aa0df8ac063f235816c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pixomot.ru/uplcv?utm_term=play+player+apk PDF link annotation
    • http://travelsi.ru/ckfinder/userfiles/files/76781550629.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/daruvene.pdfIn PDF document text
    • http://ipceurope.com/assets/file/nuvelazazonew.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/16951942161.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210904070441243.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/99595396889.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gadexezegapotulabij.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/60581871967.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/risiz.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/80769102864.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210908_CD48825D09B4D521.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/49ac8c6cda497e0ff938767dd4046419/24007034557.pdfIn PDF document text
    • https://tigapilar.com/upload/files/58583125581.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/43092575218.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/83537158628.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/28030350874.pdfIn PDF document text
    • http://lamay.de/userfiles/file/wipaweremejumunobeno.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/91012616823.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/31323356054.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-3/20210903195804402420.pdfIn PDF document text
    • http://lblussana.it/images/file/74805395263.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/93246922426.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/96082810782.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138101a0c440---welatikagakuxanatisex.pdfIn PDF document text
    • 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_off0000c089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC089 9872 bytes
SHA-256: 662e44690e85796e045472e836570069fb10b2bd1e347e163c79eefda84e6afe
font_01_sfnt_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 20340 bytes
SHA-256: 98707adf458940d20da90d58caf6e7a5ede5b2cf88db8ca6ddfb0b23bc7ed434
font_02_sfnt_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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