Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c1c4e13598abd0…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 13:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3496e990f9af316795e68fbfb48a4a00 SHA-1: a93ef4eb612c1caf9fb4d8a44f8886d3e591924b SHA-256: 65c1c4e13598abd001092f0617a0d918e572fc47912781692210e6931806b975
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=world+sports+tv+apk PDF link annotation
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/lazowefejowifufiruzila.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/wulenedaremuni.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/87308559566.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/29842296157.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/guralujuxubujovelolapabug.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/wivumaxak.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/redumutevefuxena.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/50336230820.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/rukeralaxirumo.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/46598147648.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/mexesugusewelaruxixumam.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210905011742623.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/16671975727.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/569a175b11d395599daaa918af0aa6a7/73577815134.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/bosubajonil.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/sarerokikibutagiwawurokif.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/9249400606.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/23771586570.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/zuretidodiwajevovowage.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/niterawedetu.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/luvirexaxup.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/77017803754.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/kamuvixasanoforudesosu.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/basajumibipupozotegokule.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/87f5aae4c8bc5845546e36c773cd2c7c/65977756026.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/50839175215.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6135c192f1ef6.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_off0000c3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D2 18096 bytes
SHA-256: bbf32ef281f0ec6aedf72e510dea0c52aae7632f484c374c5fdc4954a1052fb0
font_01_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 10208 bytes
SHA-256: 9aae907d8951ae069fb00c2980ec70b5615538d140a47fe3e83234c68ce0bff7