Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb9f759a96dd9ca…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 03:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd51b2a8806da9a798c7bb6bd14160f4 SHA-1: 3b6156be9b520d9bee314a19967616ca646c15f2 SHA-256: 0bb9f759a96dd9ca5c1e0a1b79fb33d24e48e3c26143433dbef502f5f8e94f64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, identified as a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. The document body was unreadable, but the heuristics point to a malicious PDF designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://unique.global/wp-content/plugins/super-forms/uploads/php/files/425dea34dfffe3940835b881001f0b5e/27101546116.pdf In PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/vipubedil.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/zeruri.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/38064350954.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/44980706161.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/zivobemuli.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/66016736104.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/solukuxisotupise.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/06f6bd2ec7cf70bbc63c90b0cd7bfbc1/daxiregede.pdfIn PDF document text
    • https://unaizahic.com/Files/files/4889718632.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/56062744117.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/nedizakoduberozunas.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/5106088004.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/zuxewumuzimubanekuvu.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kekuliwagezikiwamaka.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/mozofuliduzanukalumikik.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/laxuj.pdfIn PDF document text
    • http://jucal.es/images/file/80283569869.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210904_661938B2FA3FC610.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/09/file/jalujefamumemi.pdfIn PDF document text
    • http://clingac.es/d/files/1794905347.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/14376002665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vault+hide+text+messagesPDF 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_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 17324 bytes
SHA-256: 145d6232d5de9164f9afc203a31080f9afab169eaa5343f2e69cc2d5ca095781
font_01_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 10540 bytes
SHA-256: f1bd3ad6e5e1baed3d645ff9efc6addb0801a5c5be9a07e063859342b0246841
font_02_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1