Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adb3b8e3f0cf09b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 00:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 95afc2a470c7f2e6ff2a2f69d8ee2ac4 SHA-1: 46eb652317d7f1d43e797c2577ff7b77302954f8 SHA-256: 1adb3b8e3f0cf09b01c5d3caeed772dd3be2076be3c6f7df120c6b1b079a039c
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically for phishing. The 'SE_MFA_LURE' heuristic indicates the document is designed to harvest credentials or abuse multi-factor authentication. Numerous external URLs are embedded, suggesting a redirection to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://queure.ru/uplcv?utm_term=gmail+material+design PDF link annotation
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/dotibi.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/412dio8uoosu76obas5cdub811/bigupafatoporajo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/nozapeliw.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/39571991614.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/8381128155.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/jufit.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/65662912841.pdfIn PDF document text
    • https://nexapos.com/upload/files/teludinup.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///pepuporanasulosaxavav.pdfIn PDF document text
    • http://jawarakreasi.com/file/lowid.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767b24aad4---nijipunezugafumosuwolap.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/difejejatadifajegugovi.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/nesimijisumisejelurar.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/wineluloku.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/dageridazajixemudiwobir.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/lesesibeberofomopuko.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/4028653743.pdfIn PDF document text
    • http://mfahk.com/upload/files/46798591761.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/taxeretosalamaruwo.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/32525938837.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/57408672746.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/munupuruxakuwovutopufewop.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/69829820241.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/11922077030.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/58722597454.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/japerarimaninadogurilur.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/65101539507.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/xujidawodabav.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_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 18484 bytes
SHA-256: 02104e439196426d919d09e84d0de3a4f8467d550445089883af65baa93a61de
font_01_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 10512 bytes
SHA-256: 0cd1f4eb766a8683cb78f12afa95c0392d9881014075f4456c35b799a4686276
font_02_sfnt_off00012722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1