Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dae0c41b665e6f…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 20:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53501ea8580a6f3e8fe26125f14dc816 SHA-1: a648e83ced1dc08df4ecd4386f387a9f59fdfbb1 SHA-256: 19dae0c41b665e6f15cf8a12c36a1b5cc3a6cb1dd77400cef96fc5cb395d4140
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are structured as download links with UTM parameters, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=download+snap+on+pc PDF link annotation
    • http://youil.org/userData/board/file/titazobisidijemuj.pdfIn PDF document text
    • http://salespate.com/userfiles/file/75150863153.pdfIn PDF document text
    • http://techmechengineers.com/uploads/ramumuwe.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/24714285000.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/pilatiduxez.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/50815869762.pdfIn PDF document text
    • http://glttek.com/userfiles/file/dapuwevaxajovu.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/girulisanadeduxurer.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/befakigo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mumekaxorovebugumokodi.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/52414443204.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/91605342386.pdfIn PDF document text
    • https://inarsindbari.org/uploads/53690918777.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/kufebaxikiw.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/70089792240.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136dd4a65900---luwunitado.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/sebibutagu.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/82332505409.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/34935560249.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/nagigenatiz.pdfIn PDF document text
    • http://generaldistco.com/images/file/58195387209.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/daginera.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/milolukosopemade.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/jakamexi.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_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 18160 bytes
SHA-256: 1a3e2c5ecd2fb33caf1ff75f95670673384d5529de946d979a623fb35dcc1ca6
font_01_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 10172 bytes
SHA-256: 3afc5cfd89a960ed5538b5831ca6a81df236934072cb84ef61f2823778632997
font_02_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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