Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da44fdd06535fce…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 13:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c5d9201dd958777ef55e564d6ec3ac5 SHA-1: 64a630351f78ff23771ac13db8de430948f15c01 SHA-256: 3da44fdd06535fce6dcd4abe177526222dd7e03abb7c817d0e62ae3475418ca0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, with many pointing to disposable hosting or potentially compromised sites. The PDF's structure suggests it's a link farm, likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tecnomatec.cl/upload/file/mabibalawetimorazi.pdf In PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/8522156394.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5d4d70807905ccc4c963abd35c5c6084/90096571455.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/fefegininisu.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109031651487566.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/gidolitawononel.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/59728889590.pdfIn PDF document text
    • http://scsytech.com/upload/files/sidukix.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/suvop.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/tasekemili.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bfikcjmn8isqsbmmoplq93li08/kabegosevilof.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/wilebizedekibolevugo.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pibuxisidakejoruwazizeg.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/64811793621.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/pilatedomis.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/6647930228.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/jivuj.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/guguxubibetajut.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/xozawidaguwiduka.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/84944902994.pdfIn PDF document text
    • https://topupdana.com/contents/files/sijipodedefekezomukodata.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/15597769812.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/50463327489.pdfIn PDF document text
    • http://www.77ice.com/upload/files/golufusejajiganamij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=blank+speech+bubbles+worksheetPDF 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_off0000ccb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB9 18048 bytes
SHA-256: 1f2ade99ac3e0cbe1eddfa53e084d85de9853d14506d3821ebe12a322fcee869
font_01_sfnt_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 10852 bytes
SHA-256: cb004abba952426652dc961ecea17cc0b1ee51357f164e7844d11c5d2a893d6c