Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb3d964fe9c4ac5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 09:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15e522386a5aa39ae074ea0788765af4 SHA-1: 4e96578f981feaeffa095a490241d53466aec64a SHA-256: 4eb3d964fe9c4ac5aeecd61f0eb5072e7751c411a69204f1f62ed08a1b9d0858
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=watch+yesmovies+online+free PDF link annotation
    • https://rosewoodcity.org/nbloom/fckuploads/file/vogekamolu.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/24050932345.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f9560d15---42282477840.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/68019492663.pdfIn PDF document text
    • http://hkacca.com/userfiles/vazugaporogabafonizol.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/16539032383.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/18278550462.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/80859951990.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/sagifaladajulawazakok.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/53677989824.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/pivosamulejexixedobude.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/27809676751.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/82582935929.pdfIn PDF document text
    • https://yifff.se/userfiles/file/jakemukoj.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/waxos.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/xineruxelivepi.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/gajuvadojebomij.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/nabinosila.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/ditenara.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/lotim.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/25555759016.pdfIn PDF document text
    • https://ewt.cz/res/file/95756383852.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/39209394736.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f8e396a8e9f5536d7b68c763ccb06200/38165671004.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/funipogujasasaz.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/bojijuguko.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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 18348 bytes
SHA-256: e6c5135f82b9961dc5e3a9c449ccc27d7328be4b7f92d2e83ee74a29f7bd0d72
font_01_sfnt_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA4 10776 bytes
SHA-256: 7f096f60892695999d099ff52d9f63ab8ac9c12b2b14b373639c00a44ab53c54