Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f741bc5c2e2c66…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 20:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0ca22ccabd6f6a86c2ad0c1a365003f SHA-1: e079757ecde09691a81cc1cd3d80952f60264e83 SHA-256: e7f741bc5c2e2c6617cd91003dde28c413b6236e695b2128706241d5caf46707
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious or unknown domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.edm-medical.net/ckfinder/userfiles/files/19181118637.pdf In PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/22314669321.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/69300568760.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/79286917715.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/81380710866.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/26129523457.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/wezemuzuvot.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/nowodajowizoju.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d8a9795e1---37168612576.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/70378290021.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pusomebubulanepizis.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/pibakosewu.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/zadamiwixexiduniwoba.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/xevigu.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/lerefe.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/44677623367.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/mevotu.pdfIn PDF document text
    • http://surausa.com/uploads/files/xosizamosofewoji.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/90500965946.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/48534748190.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/78609943564.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210904052551.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ff6e0906a824b363799fcd5b873adf6b/61089761340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=jailbroken+firestick+apps+for+tv+showsPDF 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_off0000db27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB27 10952 bytes
SHA-256: b422620862278dc5d4a1ad603e20dd788e6860e657608f2e6ebb6d0592f42971
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 18000 bytes
SHA-256: 0eb7d89c8fadc049fabb0c4fcae51d144325b06267f8c03837123a71441bf77c
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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