Malicious PDF — malware analysis report

Static analysis result for SHA-256 edea033cc87ce5d6…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 09:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b159f7c4ff7e6a07205441b4a71970a SHA-1: 21a67a6a853178cccb84e70da0a93696144feb60 SHA-256: edea033cc87ce5d6b0a6f0dd9efb9c62d537eb9c1a5f68a483719603153369f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or host malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest an attack pattern involving luring users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ottomaniantextile.com/userfiles/file/1378207723.pdf In PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/guganava.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/27191527956.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/v547gmanpcbphq0ap5t8iqfb9a/xasorezalamarojepugejujet.pdfIn PDF document text
    • http://centronegozi.com/public/21115847298.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/runojuwubaf.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/wozavazilujib.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/nejixanipidomef.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/nofugivapapazuvo.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/zagewowiwuvorum.pdfIn PDF document text
    • http://montesantangelo.it/files/files/73262834207.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210905112844.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/60948999420.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/73956173109.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130a616d885c---salufanagudodu.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/28977770803.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/47023600165.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/xisovemuvoxetep.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/xigesejaxotawalobilusi.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/jexukafoburube.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/vukifosadubijuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pubg+obb+service+is+running+downloadPDF 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_off0000bf98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 19508 bytes
SHA-256: 41ad7c189a2705aecf1a1de9bb7f90118d02dadf4a7557cf7008f6fb9ac59f48
font_02_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 10840 bytes
SHA-256: ca44e545cc84c1bfe866cafda540b5fdddbf44558ab061b3d0a4a297a0f6e31b