Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d198cedab8ed61…

MALICIOUS

PDF

74.7 KB Created: 2021-10-01 19:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 67b79bcd30503332b51bcb0e2ff3b994 SHA-1: 575020bf78e8e98cac52c4fa79dda9a930be183a SHA-256: 70d198cedab8ed6185d51e339b8a1895ceaaf2d166f6ff26e476cc9dfd829f4d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with a significant heuristic identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a network of sites, likely for malicious SEO or to serve additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://nayyaralidada.com/alpha/ckfinder/userfiles/files/93588282422.pdf In PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/21220350337.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/5609412283.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/44361954112.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/nuxagixuborud.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/969e2e5e8f6c7f2d9a20cb1a1720055a/93076969318.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/fominoditowaguvevulegefi.pdfIn PDF document text
    • http://praguetransfer.com/files/file/riwanufodonul.pdfIn PDF document text
    • http://dichvubaove.online/upload/files/mafeloripejizowukiwaxenu.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/jofaxovakijimotuk.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/31432465040.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210924_205513.pdfIn PDF document text
    • http://appextskihjthj.handylover.com/upload/files/83774544189.pdfIn PDF document text
    • https://mcgbaharat.com/userfiles/file/katinogepitegosowizu.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/zobomujisalikidi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/37m432k6ne1ljb81h42t27o8s2/ledusirabuvime.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bakerirurupi.pdfIn PDF document text
    • http://ariege.proximeo.com/ckfinder/userfiles/files/80573497423.pdfIn PDF document text
    • http://masaze-bohunice.cz/images/texts/file/31417894946.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/komese.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/35959318839.pdfIn PDF document text
    • http://generoussecurity.com/uploads/begimutafomunazatobixisow.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/lizunabaxuxabawef.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/18604301180.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/vagezovimimil.pdfIn PDF document text
    • https://citytrafik.nu/images/file/41405019898.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/29/53341169214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=buddha+wallpaper+for+androidPDF 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_off0000bf74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF74 17700 bytes
SHA-256: ea45c91b6aec094b4d24bcdae8da2bd9d0147af32bad1e557e405bc919785234
font_01_sfnt_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 10568 bytes
SHA-256: d6dfcd5a63add4783eabeb4723fd1929ddf820ec6c339b8dddca2f3b918b5662
font_02_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1