Malicious PDF — malware analysis report

Static analysis result for SHA-256 998df76ce84639c6…

MALICIOUS

PDF

85.4 KB Created: 2021-10-05 10:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3c1a52405b2f80ba72a178e6ce96d190 SHA-1: 8008d64c121b4ae14963958a7d80bc299cbc85ce SHA-256: 998df76ce84639c63fa3449e6face4698433cd10bbf475cee26e9b03d49bb6d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to disposable hosting, suggesting a link farm used for SEO poisoning or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=cardi+b+and+offset+tape PDF link annotation
    • http://www.elstar.ru/uploads/files/vatusodamisanalupavuxafeg.pdfIn PDF document text
    • http://wajl.net/img/file/20219602536.pdfIn PDF document text
    • http://firegallery.ru/img/upload/45321837966.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/237124561227850eaea4b73bd3c978ee/79879137260.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/mudibaxowunuwasepe.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/saxogivutevofipu.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/7034522642.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/63155519278.pdfIn PDF document text
    • http://elskenecologie.nl/files/39437498167.pdfIn PDF document text
    • https://firsathosting.com/calisma2/files/uploads/23377543533.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/73756480937.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/geloxomumimitagaditigi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/11430861122.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/62203418230.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/98732684490.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/nifamataz.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/76475802027.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/jerakaxinavane.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/labawarav.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210924123827278126gwbxv6a35w2r.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/zifugisizawaxumafaves.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/8094831063.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/65788872297.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/gusogabotowobedukifawo.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/wekufovalavi.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_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 20204 bytes
SHA-256: c7e4153144bdc45d7ca99827c640e536d36779062e159cda0fe169285253d3cf
font_02_sfnt_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 10616 bytes
SHA-256: 6d3d4074187c4737c3e18f2d10b12e852a05fe32d3f64be443b70a4a89553892

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