Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1328ec01a99816f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-10 22:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2378cf450a34743ed4979e36df3e133e SHA-1: 0873af16f34a87595eaa8ca06b53f65312fde34d SHA-256: e1328ec01a99816f8a934b1a9d50aab8a185c240e4c1cbd518af7c9e11c6cdf2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. 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 0.9977

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://archism.ru/uplcv?utm_term=android+restaurant+menu+app+source+code PDF link annotation
    • http://yuanjen.com/ckfinder/userfiles/files/gokozikixu.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/sedexiso.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/jidetunajilekevopow.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/gaginutawegubuwowatiw.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/83221254520.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/51027779982.pdfIn PDF document text
    • https://ksboutlet.com/file/files/85688634256.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/lozilijezugupaboxapimena.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/89271918804.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/873550446613399dc38112.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/zujoraxixesifobeb.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/bomute.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/66911688686.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e8264ffe---32969215737.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/1341177817.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/pedanagobes.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/vubexajazonasupo.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/likizukutabuterowisit.pdfIn PDF document text
    • https://rubfila.in/files/file/wejavigofawunamujiso.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/34936685027.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/20f2fa108f2031a3fb8adf3a520c50b4/92392547749.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/dixodeniguxasepe.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/wijotexefo.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_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 17168 bytes
SHA-256: c95b05315aee644d3c969e98a3b4e7ffb4b1e64ca07e09a08e72f46d1cf8fa5b
font_01_sfnt_off0001162a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E41 10712 bytes
SHA-256: 20703bc671b92157f911e926d7be1669dd654187227d6d4b6d1c502527bad849