Malicious PDF — malware analysis report

Static analysis result for SHA-256 519f8e4fcb3b92ba…

MALICIOUS

PDF

84.3 KB Created: 2021-10-10 21:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: be8cbe1a0ecd796834c40d2150990d62 SHA-1: 118a40ef0b1054e8149966ebab3e14e0de4c72eb SHA-256: 519f8e4fcb3b92ba8348f868ddf0dc962bb97e3d00374e286806b78c49ab84f6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of a 'download button' heuristic further suggests a lure to download a payload. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=pokemon+colosseum+rom+download+for+dolphin PDF link annotation
    • http://thepartybooker.com/userfiles/file/kudotixarurisuna.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/lirisowafuwodegusaxuwuke.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/kaxabaloxulur.pdfIn PDF document text
    • https://christianschoch.ch/userfiles/file/82816012699.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/2732494893.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/vinetiriboguvalitazat.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/43803683388.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/27470620603.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/xaxuraniwaz.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/fidibafiput.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/82652953816.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/fexomazovefiduxixafop.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/wajenonejovanugiposir.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109260000239862.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/6770222822.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/miputagut.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/84355544031.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ff64a3406c93ecee1d4e913673805de9/rojufes.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/rulerijajiponipa.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/fusexul.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/84749663174.pdfIn PDF document text
    • http://simonide.org/userfiles/file/87144934538.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_off0000dcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDE 20072 bytes
SHA-256: 19361199223e65360e055ead2afb417610a76c8e9159a7ea536a2d7eee1b8a27
font_01_sfnt_off00011167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001297e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297E 11068 bytes
SHA-256: dc6b73a99889118fdce15a9b019694e1a2424e4839722c16abef59b7f916b537

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