Malicious PDF — malware analysis report

Static analysis result for SHA-256 b477d53496218a87…

MALICIOUS

PDF

86.7 KB Created: 2021-09-15 17:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39167165322a0e42af9e5389e0325751 SHA-1: 4e42e4af596b32d7b1783baf6cffcaddca5b2119 SHA-256: b477d53496218a8788b28e45f9cd2079f4d51390cf591b2899f9eadf90932a67
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicating a likely phishing or malware distribution scheme. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=android+xml+layout+templates PDF link annotation
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/21709532086.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/46041260665.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/71271662271.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/14111756608.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/969649ed852cf947a5e04e0df3baf77e/6836671803.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/nuxejejokoxomapesaxuteg.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/efce20f48801fa2b6b9f92ec28a5a9e2/visolalimegunopisona.pdfIn PDF document text
    • http://lulanjina.net/upload/files/48973747456.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/jasixudaxasim.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/72870378187.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/76750018356.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/sudinegulikikapiponiwuja.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94244377549.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/68658797676.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/744812453.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210908155555.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/kuxesimum.pdfIn PDF document text
    • https://fishboat.hr/files/kufunuzafunejoji.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/8521474301.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/75861688986.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/54576718331.pdfIn PDF document text
    • http://grotech.in/userfiles/file/39604535481.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/6870250535.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/21059601842.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/siwekubidobono.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_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 10852 bytes
SHA-256: 5a540e3597fff293be852d4c3031af21043ce4a4a564973f609a7822dddb506d
font_02_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 17324 bytes
SHA-256: c28ec8a9ca95e9d2ba34565398a9881f5400ab866008c60e626305a4a22ba83c