Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb54b293798ae61…

MALICIOUS

PDF

75.2 KB Created: 2021-10-02 17:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db12a6df759c2c4a132238f2b7955377 SHA-1: 645365a05f877055b2a5b220f265e1752b0d9efd SHA-256: 9bb54b293798ae617c8847b72665c1923a7252d582ae8bfc677785ba86b4bab9
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and malicious classification suggest it's designed to redirect users to harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://glaskunstcentrum.nl/images/file/72138669583.pdf In PDF document text
    • https://vnnc.vn/img-hdmedia/files/86337906184.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/sipovilipudobelekeda.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/katoranobo.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/nedurixukabit.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/90466477505.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/44318217699.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/refilefazixigawajapiga.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/tegepujilunewepasaboxodag.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132819717246---6647267267.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/93pgfmt6atsveedc7l6i15m7lr/kosikirepebevavetanef.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/tefalulevetup.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/36817285531.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/xazefobowutomari.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/keradudabafaloji.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/kolexulam.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/69560247011.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/kajefemajosirudutipunuvol.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/85753535104.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/vubipimamijabakamaxoset.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/74178077008.pdfIn PDF document text
    • http://kamila.mebel-moscow.com/content/xuploadimages/file/limub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=meaning+hard+copyPDF 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_off0000be5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5B 18948 bytes
SHA-256: 4d912d0e7e47b9815c3abded42df5b44e6ecdbdbaf6cd302cdab28fede1960b6
font_01_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 10588 bytes
SHA-256: c00cd553d1e1b1a48b0011472bbb10f75a1ea318ad9f933fcff771e608f8e6ac
font_02_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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