Malicious PDF — malware analysis report

Static analysis result for SHA-256 455b9d492f75a407…

MALICIOUS

PDF

70.6 KB Created: 2021-09-10 11:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0a5ab570bf557519405634f012d955c0 SHA-1: 8071af0c784bc6bc93181a94f46a9829f00804ea SHA-256: 455b9d492f75a407b4c9d7cacba9354b06d8a173c1af3b6949bc2b7531dfd341
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://dokturmice.com/ckfinder/userfiles/files/84235534505.pdf In PDF document text
    • https://diarch.in/WYSIWYGImage/file/17104473103.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/gimanirumitadagagedat.pdfIn PDF document text
    • https://premium-house.uz/images/file/80753079040.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b31edb5b8---37597492781.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/21031940354.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/wikepoberatupi.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/80718479366.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/toreguliwakijur.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/95336008737.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/jepanedodemexowup.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/toveb.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/kejanog.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/7077843449.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/31761122839.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/11170267159.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/lezitexodowixegunikenix.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/86142706806.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/wofupagukavemilose.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/xuvusaramulirawegasufo.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/bupuxurazijovivojubinera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=find+the+sum+of+the+sequence+calculatorPDF 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_off0000b3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 10964 bytes
SHA-256: d7085d00e0709367901704da9e6707275ea151aa7d55dc2b5ca42dc492030544
font_02_sfnt_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 15752 bytes
SHA-256: 41eb89c48100b5c2c2bdb5ee632bd9a1e8871a447f5bd02affb63ff614d2ef6f

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