Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2805b65debc1a82…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 07:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2b319ce75530e56b4890f03818f9543 SHA-1: a6b15f089aae252b056d7b620bbb1717853a786e SHA-256: c2805b65debc1a82905649618c8854957c7579b105661a6e96c1aec529127c8a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests it could be used to exploit PDF vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://censcakmu.org/board/file/files/69400324430.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130371f8b06c---53950506235.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/sewogawotupulit.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/94893410065.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/31865304126.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/xibadazomovelifalevab.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/kemagulepoxuninolulajemi.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/sazuneserizasututamob.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/79255514224.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/33207942840.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109021101083958.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/gopiviviva.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/49105678157.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/sovalenidiji.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/18007943844.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/36762950757.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/15916947539.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/sanibuvenagan.pdfIn PDF document text
    • http://placc.info/up_image/28759794817.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/85514696950.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/27892501974.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/71647343118.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/denuvorinaguxat.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/81769952119.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/bukunesiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=emuladores+de+android+para+linuxPDF 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_off0000bf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 17444 bytes
SHA-256: 1f76e16175448a851a013d4a1c21ee897a28b36b7fde85d80ce0114526bf5b23
font_02_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 10640 bytes
SHA-256: a84ba156f96d5cdfaf8bf41a85d81babeb1c43074bb7f86b3812a6ada554ce3b