Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bb84b403e063e8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-11 17:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2be05ac4d70d2525181309ab69ef1a6c SHA-1: b44a742b51c2c3fb76aa5406ae0e90fded82734f SHA-256: e8bb84b403e063e89a2ec87666abcf60acb7c5678e75b29ef7d52f0f65b3913d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic indicating a link farm on disposable hosting strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=hello+neighbor+alpha+3+download+android PDF link annotation
    • https://asiapharma.la/files/files/54759248440.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/rebizivufu.pdfIn PDF document text
    • https://netpage.info/userfiles/file/25523473282.pdfIn PDF document text
    • http://fabtur.ru/upload/files/22988645037.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/misetinekijibenodi.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/mugujefetoluwedefet.pdfIn PDF document text
    • http://santabruna.cl/upload/file/sugitadosugoxobozuloj.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/saruf.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/mabodotar.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/xugazepimizozojaparebap.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/xewerupako.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/75088656521.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/bapelubegofakufasilup.pdfIn PDF document text
    • http://i-physiology.ru/upload/midel.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/sebip.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/48772496228.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613163bb18623---881447662.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/87590873117.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132768fa6560---tebajowada.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/wuwuwuzewosukenerek.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/42759736825.pdfIn PDF document text
    • http://373113.linker.tw/files/zoduxalumimudome.pdfIn PDF document text
    • 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_off0000afe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE0 10792 bytes
SHA-256: 3b52ccce94aa3db5e4e2934c3a2e260e04bdf42ce2e3454cb84fb147c7c4e85d
font_01_sfnt_off0000c82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 16828 bytes
SHA-256: b9bb506ac0d22a1d63e1bc068fbc91f61da50db58896afd77dee4f0b2834faf1