Malicious PDF — malware analysis report

Static analysis result for SHA-256 3369d4bc75e9a00e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 00:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a4d0fc685d5d44cede42ca62ba3243f SHA-1: 117f091fae6f81743dd3bc19d71ca64ab99410e0 SHA-256: 3369d4bc75e9a00e410e3bcebbc31d32d0f2c25c3c9820632f0291c7be95addb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristics indicate it's a link farm designed to redirect users, and specifically mentions an MFA/one-time-code harvesting lure, suggesting credential theft as the primary goal. The presence of external URIs and the nature of the lure point towards a phishing attack, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=instagram+followers+for+free+no+verification PDF link annotation
    • http://www.jindatunnel.com/up_files/file/39012909982.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/54007574010.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/bekimodavizimipa.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/pifufovevezexavag.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/10037336964.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/3097724545.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/67252365221.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/61209653735.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/74749502711.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c8837ca38a521ef1abf361a92c6222a5/48841770637.pdfIn PDF document text
    • http://tavio.su/files/file/sexedawawikibatu.pdfIn PDF document text
    • https://x-software.cz/data/file/wizob.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/deneziganozigebitiniride.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63d10a51b---55250880525.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/81562070318.pdfIn PDF document text
    • https://mimpishio.com/contents/files/18469204587.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/gadalujamogulef.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/konitew.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/votedozelujaxetetamu.pdfIn PDF document text
    • http://stylekd.ru/files/59436358417.pdfIn PDF document text
    • http://scsychem.com/upload/files/dexire.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/sazes.pdfIn PDF document text
    • http://dnepropress.net/files/file/werisil.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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 10784 bytes
SHA-256: 0b080406b2800aac3bcc479c29fed5518b9c59380d59b9582f1feeeb7df23a9d
font_01_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 17764 bytes
SHA-256: cefac2b421db147a94bb8c4b5bd65bbd1c75b2a130895c4b9fba124ff9c7e1c6