Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0581afb274018c…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 01:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8eb45303eecae1c113baf48de36a2928 SHA-1: 0f643808fb27464712cea73e3117585159dcd993 SHA-256: 7b0581afb274018c6581b893736690e054a43b967f35db2dc450fc10923721a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a significant portion pointing to domains that appear to be part of a link farm or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights the nature of the links as a potential lure.

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://weborder.cloud/userfiles/file///megawusipo.pdf In PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/tumibojurimetufasamujuvok.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376c866eeec---67900655882.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/kanatu.pdfIn PDF document text
    • https://braus.uz/images/shared/file/66215534441.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/fikelugevofikobejizeke.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/38072ba9dcebcafcd17c4f276ea9a2f6/37612386291.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/78632097975.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/30448758547.pdfIn PDF document text
    • https://soechi.net/userfiles/file/15645375679.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/wupaluzugowelupolir.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/75248540536.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/71890009126.pdfIn PDF document text
    • http://santabruna.cl/upload/file/87279551619.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210911171555.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/xafudoronudopadutaderuwu.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/9504329039.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/2756097561.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/mipuragavagabola.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/98591120707.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/roxusulinibibutixi.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/melobikoxuledit.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/77248133629.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/77588566624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=devil+wears+prada+streamingPDF 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_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 10768 bytes
SHA-256: 04764a30b4c64911658a9be26917c841ccf942cb2f9a166f6501421247191c53
font_02_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 17956 bytes
SHA-256: d1914f6ca3d672b8a2123194d25ca4cbac7e942195ec31a5fa50d8992113c011

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