Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dd2520e39002cd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-24 00:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 96e54e25155fe1a5c8ebcf37b46d7695 SHA-1: 7bdd9cf2490be91f5c3a6942766b61c67c3a44fc SHA-256: c9dd2520e39002cdbbf24ded70614503ca5b420fe570ce7315496c440ada97c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate an attempt to redirect users to potentially harmful 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://irlanc.ru/uplcv?utm_term=brawlhalla+apk+download+android PDF link annotation
    • http://aapltd.net/userfiles/file/12511942960.pdfIn PDF document text
    • http://stringladies.cz/userfiles/guxugeliwetakufudewilifu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc570108f---dakigowilulifo.pdfIn PDF document text
    • http://ustunongel.com/image/files/farudemajomoketonad.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/fujufanile.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/nevifodokinoguruv.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/43825688108.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/jadirotinabovoxafuv.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/74383860795.pdfIn PDF document text
    • http://orderkai.com/uploads/files/6424096105.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/38717012234.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/5579019709.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/49018468082.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/zabejeteroruten.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/72998929060.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/lopedesip.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/77913416294.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/4285379773.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/84120781795.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/1742490668.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/suxafadiraleze.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/77229238160.pdfIn PDF document text
    • http://hodori247.com/uploads/files/golazimananenivofunegonu.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_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 10324 bytes
SHA-256: 215926792f662e4eb661ae2d08ad63d89deb5f464829304eff40a92a5ebfaa01
font_01_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 18744 bytes
SHA-256: 9c23c4ec526dd586a4577cf5206746f52d262e8cbe5faa0836dafac55470ff32