Malicious PDF — malware analysis report

Static analysis result for SHA-256 937a10a1cd4a7f8f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 10:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dee07560e3ab4cb2533c41c09373e0fa SHA-1: 9c8a9f71c5e81f1253b752fc65b0a71be5c8ed46 SHA-256: 937a10a1cd4a7f8f0fcc14d756ed80d084851321c273c8d95b331e02e9673e57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=bad+words+in+korean PDF link annotation
    • http://uptownfallschurch.com/uploads/files/78565088673.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/sakidomomuzuzanuvu.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/58424863413.pdfIn PDF document text
    • https://verner.lt/images/files/85168124103.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/75484646675.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/37972e990eab08a1bc69e039d24a7919/derizapipapepugifixosesix.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/lusatinav.pdfIn PDF document text
    • http://thevalleytrader.com/files/napubuzuzulodeveg.pdfIn PDF document text
    • http://client.diffuse.info/files/sozuradovodonopi.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/rogukunikojexupomufim.pdfIn PDF document text
    • http://sivam.pl/files/file/sevujizusufopoxotavawu.pdfIn PDF document text
    • https://gilbertems.com/videos/file/xijamomuliwazis.pdfIn PDF document text
    • https://le27.fr/docs/file/68400606395.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/98297086485.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/35591507690.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/76667371735.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/poliwumefekugijaminomab.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/84224803849.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/ririnek.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/zivunonajun.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/jipuwul.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/nomufuvepo.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/63657563178.pdfIn PDF document text
    • 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_off0000cffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFD 10328 bytes
SHA-256: 4b915cb7b27b2ef76ff3ae22d975572f50fb0cfc7ace68a986001a6e0b83822e
font_01_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 21644 bytes
SHA-256: edfd959f0d2bb47fe332997f3439679d373743cb85b137f34c3997a184d480c2

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