Malicious PDF — malware analysis report

Static analysis result for SHA-256 64db02f05d951425…

MALICIOUS

PDF

95.9 KB Created: 2021-09-14 05:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 444384c4d3cbffd156531428582cc803 SHA-1: da26001fe8002e0de88f2eda832188b07fecd5fb SHA-256: 64db02f05d951425618400b5ff5982f4ea56f6ce11bd7deeceaf890952e177c5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware downloads. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://postelezmasivu-zlin.cz/ckfinder/userfiles/files/guwebetafo.pdf In PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/jirifexitepirerap.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/zibasidowubigejibuzupob.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/028bssnjbm2ahb97nbabgiup3l/30175933847.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/ralexegave.pdfIn PDF document text
    • http://land89.com/ckupload/files/pikabake.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/nelipabifevexulewoke.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/widoxamij.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/55067679113.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/jamokebanefagefineduk.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/latiwa.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/68312096453.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/rakuveduxigagamaz.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/46026899209.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/10020263930.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/misokojixewevozitikazos.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/90778941787.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/rofusawazeg.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8eff6a94d---51889237515.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/miforeritibogapowudesume.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/vitapabawiwejuxin.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/fowiwevoton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fortnite+s20+skinPDF 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_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 10204 bytes
SHA-256: 3ce03d382f36399de48d6d714acf6b1cdbe4cc7e5020e1d053f7a06b78a7ea0f
font_01_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 19860 bytes
SHA-256: eb3e19b6deeccd720f4fdc6808379e87fe41481da9e984cd94bed5ddf133ebd6
font_02_sfnt_off000159ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1