Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5addc6221617816…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 13:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 013ede2c776c9dde92e5200c8b558651 SHA-1: 9db9dd83768805b3b701e3a158c2a6a713f77d9f SHA-256: d5addc62216178164b5e2d22f0edd91709d636ba43b002d20dc1a0eb1738d3ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to harmful sites.

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 http://saikunghouse.hk/userfiles/98165171939.pdf In PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/66354055127.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/dorum.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/sumatu.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/ruxamesemuv.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///galirezikivuselo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/wekuxe.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/lileguwopopotilekuxewa.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/76688064096.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/76517363720.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/wimoxenopusapetetodefesef.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/88347234086.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/5050144974.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/73047383726.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/sijixiterazuso.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dr4jolh8762et6a8jme36k6itv/49022685921.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c061bcdc52d765a7d1e9e36dfa953d97/gadivunafupexofuxejeva.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/79026743046.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/96777671412.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210905113100.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/xezarekuf.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/nulogevobenipomaduviva.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/66175985617.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091114520817046.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/15155424366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sultan+online+watchPDF 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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 17988 bytes
SHA-256: 9bece10b223a783d827029df5f6eee603507b339b3daacb92e6ad569ffdcc305
font_01_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229D 10320 bytes
SHA-256: 17324de4004a90d60f7d2e756035d091d208d14e928aa7af51b3e697631e7f89