Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fd90690562c57d…

MALICIOUS

PDF

76.5 KB Created: 2021-10-08 11:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4d7a2b60f1f0535652b777516419561e SHA-1: df10fb46190f607207fada34538b9b4240f64607 SHA-256: f4fd90690562c57d04f599328c8a4f1ba6ad9af02b319612531fe4ea0989489c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm on disposable hosting, containing numerous external URIs pointing to various domains. The primary attack pattern involves directing users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=dominate+meaning+in+tagalog PDF link annotation
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147df0236651---47705720774.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/29481431217.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/99340006625.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kukileboxemakaviw.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/jadapabagufebebol.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/rotupimaxawovowapala.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/17382527386.pdfIn PDF document text
    • https://beautydent.hu/editor_up/27181341620.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/larav.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/78578011330.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/73256192953.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/wigiba.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/17874462314.pdfIn PDF document text
    • http://carywinslowlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fufoxigafoturisa.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/vifedezokam.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/11893744242.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/25215344190.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/patafugetuvitiserofi.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/guwolibevabavesebujalime.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210922122536.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/26406858305.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/bee90f48c47390e9364efa50cb5714ff/jerasibanujusuwarujit.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/45511062053.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/36165988452.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/20940265564.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_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 10184 bytes
SHA-256: 4d9f21be5cd0930dcaaefee7a379b6c36efa3e4caf88f4c422d4291e51d90152
font_01_sfnt_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 17632 bytes
SHA-256: aefb948a8cd228a5b2b59941b2fc42e24450030132d616831003fd7b9034d2b3