Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d836f8b49b08ed…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 15:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4ebeaeaf5eab6d0d61a6168f39f69d2 SHA-1: 1091cbfd924828e9feb779b3072fd0fb570cef4a SHA-256: a9d836f8b49b08edcd542f003a5bdb8869129ce829a39a69e7c3574ab1ac51fd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://uitetenindex.nl/images/uploads/31862744152.pdf In PDF document text
    • https://omegaplus.bg/uploads/pages/files/goxaxivikefa.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/vovekatajimofojenavixafo.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/42457347938.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/21788824928.pdfIn PDF document text
    • http://bamila.vn/luutru/files/31550642059.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/42852402708.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/bezemosuj.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/2682720103.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/gevodex.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/29798839782.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/kimamipobetu.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/97996125908.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210925_327F1CC262325CA1.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/fiwegapibapamuvagaf.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/tileveninabiwazosofetunep.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/pabifaruzurelu.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/vupamita.pdfIn PDF document text
    • https://anakmeong.com/contents/files/gidokisazikeje.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/4973963871.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210902150533.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/85781951386.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80c262639---miroboxuximoj.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/65211642837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=psychopath+free+jackson+mackenzie+pdfPDF 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_off0000b050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC862 15924 bytes
SHA-256: 3dcab1cf24f2306380e680a67ca29fa184b98c2425bd70bedcd7ba8d6cf96f9a
font_02_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 11236 bytes
SHA-256: 4ad76343707d692006144886d5b66911751e1fe9b1da959bf4730cd493556623