Malicious PDF — malware analysis report

Static analysis result for SHA-256 6726dd3c47dbf4eb…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 01:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49c470c826bd20327d704f93f7cf9b86 SHA-1: 23477e18a1724360e28673f17a149abd95ee263c SHA-256: 6726dd3c47dbf4ebbc2cfd57097a8cc2501d94232b1ad5d1b5a27ee652f4e931
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests this is part of a link farm designed to host numerous malicious PDFs, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://speckrepeg.by/UserFiles/files/96081294921.pdf In PDF document text
    • https://kaparatt.com/images/File/25044728891.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/12659063736.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/14964855951.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/veweje.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a19a775d---kenorepetoj.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/7808460583.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/21201804612.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/jubiboxepebitemuf.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/maruvemiboz.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/dukixezopurijes.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/komajoxavolativiz.pdfIn PDF document text
    • https://bnovum.hu/downloads/wumowafazilapidubabolavix.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210913190947.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/nakob.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/tibuxawudagiju.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/fikiviporuroro.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///mumidilo.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/7724657846.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/79020755885.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/71360878889.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/41408812350.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/135187d446a88e6afc18e968735f5e75/75497212146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=popcorn+time+apk+download+pcPDF 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_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 10684 bytes
SHA-256: 06c154e82780985b5501c4f9e3399b3aee4f3bda9fcfc313aa6dc01bf8cf9884
font_01_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 17604 bytes
SHA-256: 3c1c8dc13032f274ceb42f7a89f82738570094112457c7a1abb73a1ccc2ab703
font_02_sfnt_off000118a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1