Malicious PDF — malware analysis report

Static analysis result for SHA-256 90af18974734cc4d…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 09:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf77f0b46f4d07a29df87d41d7b096f6 SHA-1: 54197950a8460af4515346f7eabc5823b800e038 SHA-256: 90af18974734cc4d2d1ff1af7078f1147d424000503db941d66c485e639683da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external PDF URLs are embedded, suggesting a distribution or SEO abuse mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://motodubai.com/uploaded_images/files/78686115049.pdf In PDF document text
    • https://skywaynepal.com/userfiles/file/kaxitenukabu.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/xakav.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/fopejepedadipu.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/sanugipidemira.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/defemowikegefa.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/woxarimutepiwovu.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/taxumejidimokizudilubikot.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/37482338774.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/42536726017.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/wolexovevubo.pdfIn PDF document text
    • http://fitviewer.com/files/file/gulesapaxudexojemukikuwuz.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/bogefenuwivuza.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79e148c11---sopezo.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091113261570554.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/57468801461.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/95798008482.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/3a9fca00d33443fe3e18062597383140/kijomumefafa.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/wekusiv.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lebufevani.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/fibovasewekoratepuvevum.pdfIn PDF document text
    • http://cutskytools.com/d/files/tidepaxa.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/5271332536.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/nokubogiwatipid.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/gurutadexikogininono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ultimate+ben+10+gamesPDF 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_off0000c730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC730 10552 bytes
SHA-256: 33463355fb483abd011baf42e4d7795d21e3b15cd07cc197a3c7512e9e8f7521
font_01_sfnt_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 16976 bytes
SHA-256: b2be946f78bd18b33b033995fafa02ac617281ef768df6e80aa14be264625926