Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ad97fadb0e8901…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 06:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99795393ba8197d405800f9674bcb1f3 SHA-1: ece75198425e08a789546530f29114cd03ca1c00 SHA-256: 11ad97fadb0e89016bef916c57d352012c6c908ed8c7f4d1cb7687dfd2354526
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to various domains, suggesting an attempt to distribute malicious content or phish for information. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://costarica4d.com/contents/files/95284940220.pdf In PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/galexelelori.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a1c039bd7---datedotedanuvu.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sixetuvemiziwakikunut.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4efd681bda19f977c72a921f48313ecb/rusotafegosedinunufasodet.pdfIn PDF document text
    • https://jensbrode.de/files/file/52944627127.pdfIn PDF document text
    • http://gojjang.com/uploads/files/39737321003.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/10447537738.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/zepupinefadikove.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/52643248478.pdfIn PDF document text
    • https://unosms.us/userfiles/file/saloserevekejiwofuwubidew.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/68386970939.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/25707455027.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/moxobekivuronike.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/pijixupusujefibonidizali.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/89868686070.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/feruwaroziduwexar.pdfIn PDF document text
    • http://salt17.com/userfiles/files/wusivawofejapodisoxe.pdfIn PDF document text
    • http://premo.at/userfiles/file/xuniwopukefazilisom.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/52818390185.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/bowetirukokesadajev.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/timodipivasom.pdfIn PDF document text
    • https://adikketiga.com/contents/files/miramofovitekizuzilunem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=google+vpn+androidPDF 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_off0000cef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 17820 bytes
SHA-256: 57e5f191bb17c0299acf38f5beed168a1a4a350588572530073d399d27d8da7f
font_02_sfnt_off000114f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 10408 bytes
SHA-256: efbefee74998ca5082972089c80a1d498186b0f9aa35beb93c5567de56e1f792

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