Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1219bf4e69f6a3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 01:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b81644a6d11ba69b9f75814aa4dde073 SHA-1: 7897777dd26c242c55431f08c6ca15a38ddb1e8e SHA-256: bb1219bf4e69f6a35b5da58193491c1b31531285ccca1652acfefb8a8139d4cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing infrastructure. The document body is heavily obfuscated, but the presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm. The primary attack vector is likely spearphishing attachment, leading to the user accessing these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48663a4df---70568730417.pdf In PDF document text
    • http://microcement.ua/userfiles/file/lexubutevitemexo.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/gidupagosefivawuvev.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/vebowutozo.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/78943284083.pdfIn PDF document text
    • http://odumakus.com/uploads/files/razegigus.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/7035143095.pdfIn PDF document text
    • http://lamay.de/userfiles/file/porakiwofipazoref.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bivavimidujudadawup.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/xukapo.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/72021659887.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/fizesejeditopi.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/8530163447.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/32514382426.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/84568911912.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/27233429179.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/sugufajexa.pdfIn PDF document text
    • http://stylekd.ru/files/91028439654.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/zinufuwidosujodas.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/67428349340.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/98312580401.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/julaxarakalimominu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=arma+debt+collectionPDF 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_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 18184 bytes
SHA-256: 0ebf7f93903c279f14bbcc2281420c0a8e934cba4f77649ff3580170ef8333e2
font_02_sfnt_off00012539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12539 10484 bytes
SHA-256: a11831538944655dbead3af329a36cb09c3f046eeb455c5b1f5771f4ae50d802

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