Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dbd74b8e00b1c5d…

MALICIOUS

PDF

68.4 KB Created: 2021-09-15 16:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: faf44da5a229da91d2dfce34cc7602b3 SHA-1: ea6e8e103e0ad4ad5b8014ec230bf710cb27e55b SHA-256: 0dbd74b8e00b1c5d5631b0d8c42949c8487e887b6f6a8b972723b1e605985d27
134 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/90028469315.pdf In PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/99994698438.pdfIn PDF document text
    • http://firegallery.ru/img/upload/xilovopawowagulonozovopav.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210905152233.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/vorukev.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/vanexesugase.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/96247827620.pdfIn PDF document text
    • http://mopron.ru/upload/files/33630428447.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/88468894749.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jt9b1uu1bv8d7i2m5e3g60b21q/pidub.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0dc7f1b77---51409765800.pdfIn PDF document text
    • https://kimcert.com/E/file/5897415548.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/53349211024.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/8267664517.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/10413220370.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/zetud.pdfIn PDF document text
    • http://labotinnghia.com/img/files/vokibufo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/18117139771.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/59969109860.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/guvusoxegajabokibabe.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/luxutuj.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/50483576359.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zowapalu.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/81618103388.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/45703945966.pdfIn PDF document text
    • https://jobtiara.com/files/files/7098542155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=arabic+android+downloadPDF 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_off0000b1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 14324 bytes
SHA-256: 8c3246022fbe59098b7115aac3801218c39fe24ffcf28541766bf03ed0b77fe4
font_01_sfnt_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 10172 bytes
SHA-256: e46e8aa633be0fa5ba5ad4accd5bde4dcddc51ade30551abc69c7d984ce25a5d