Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd21dff025565ec6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 04:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fb38aaa3db5948fee694f834ee3c4a43 SHA-1: fd72e02e36d8002ada9c15b1e64cb36b66d327a4 SHA-256: bd21dff025565ec650ac268221853ac4a4f93ff604e42ae7f361f8c78b4a6482
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to suspicious domains, and exhibits characteristics of a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the high number of external links suggest an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e62f29faf33b1cd6f2afb3da872af981/lavepugekunaboridesi.pdf In PDF document text
    • http://czyxchem.com/upload/files/4207555250.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/mupezexe.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/87450340336.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16145c165aea45---vofomegenew.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/94077599003.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/51980701411.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/gimanamolubewewa.pdfIn PDF document text
    • https://slotpt2.com/contents/files/94209205404.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/57520240530.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210917062124.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/sebiti.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/domikivimeb.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/94956242235.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/rolerikamir.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/farurelumamojibukuvif.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/43451582414.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/lusalogalilezudi.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/zofam.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/68770108147.pdfIn PDF document text
    • https://biocoils.com/img/file/31183164638.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/wawirozedewemolofagij.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/bifenixiwulomibupumupu.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/domirabevofesemebefalodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+dev+gps+tutorialPDF 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_off0000c942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC942 10712 bytes
SHA-256: f8d83c680be661b388104f21a0ebf0a61eb63d2d68a7126ab3809494fbad0ac3
font_01_sfnt_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 18700 bytes
SHA-256: 3e766708fd27e9ff5158c3b458d5c635d377b82e62ba8c19c9236d0e52faf335