Malicious PDF — malware analysis report

Static analysis result for SHA-256 6beb5b539e748b75…

MALICIOUS

PDF

80.0 KB Created: 2021-10-11 02:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff5583cf188bc9e721208331a208a75b SHA-1: 647b2d685fa6dc9df02dfea8d0941376713a1649 SHA-256: 6beb5b539e748b759b10867daaa439614801b55ee3b6a1f03e3e1ea8847ef21c
154 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, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://audreyheselmans.com/_files/file/7030959320.pdf In PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/65344198775.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/91471244764.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/25767599302.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/senilifikozolula.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109031005274495.pdfIn PDF document text
    • https://sitarasign.ir/data/file/52208247721.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/55045936337.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/87142477825.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/45074642794.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614671edf1b2a---kekosula.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/veravakuno.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/57190187301.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/4994705939.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/10571085419.pdfIn PDF document text
    • http://ranchobg.com/img/file/vasudovivi.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/noluniridiliduzorinefa.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/79329632044.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/25985917654.pdfIn PDF document text
    • https://dassti.cl/admin/uploads/file/porepasabu.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/varefidofadufili.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/61642305834.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/64716458790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hack+last+day+on+earth+2021PDF 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_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 10864 bytes
SHA-256: 61bfb25413eba7ac0bff3fd786b386aab17e961f9d0cad66887bd012a8bdb86d
font_02_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 17896 bytes
SHA-256: e9289160b5fbf0a8d68ac59a4e80b90b4e1f0c41feafed4ff65814308061a0bc