Malicious PDF — malware analysis report

Static analysis result for SHA-256 456e44f7db781f40…

MALICIOUS

PDF

96.1 KB Created: 2021-09-19 17:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e85f252a3bb68d4fe064a96eb5d89581 SHA-1: a6b3f6cac774ca320b17cf23650228c34aef4db2 SHA-256: 456e44f7db781f40b298e48cbac11922eab827bc1d99cb0cd2440d745676ba77
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable hosting, and is identified as a link farm. The presence of external URIs and the link farm heuristic suggest the primary purpose is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://brukspec.pl/upload/file/75983363650.pdf In PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090507480173499.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/xifozesuzike.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/vabiv.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/nemazotolekofasa.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/81915993379.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/niberivebojefiludobusegaw.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/74811351166.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/woniriwuvoxiwifiwipe.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b84beeace---98769972885.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/jemewudonetisefasologesuv.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/kifapavamivodisifofagubu.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/gemixojipiwekuxidamojun.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ec38fd6f76dfac69fe84c489f48827d3/95497562340.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/25594754606.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/83047706253.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/bisoxebatu.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/pirafakudunutobavojas.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/13564585320.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/23097884374.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/fazufixujilodojexilu.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/63161002202.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/nefilinomorilasones.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/83354216677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+studio+emulator+root+accessPDF 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_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 10612 bytes
SHA-256: 031de680b5ddb1d7d2e5b183dd1ffa7e68ee4b0a5aa56c83f925d9c2c6b32811
font_01_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 18740 bytes
SHA-256: 9f29d28f94fd78bf7cfbaae14d533fbfa1b342559fae07ade23a5d32b0b79e6c
font_02_sfnt_off00015a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1