Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fa9e78b80679f1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-11 17:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa56c99114894a62743fb8385cc3785b SHA-1: 31942b74562a885b6d368dd76550b554377fb72d SHA-256: a9fa9e78b80679f1d47271b6a5552f6425f341ec63eca860f2978f4e0c231a59
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=50+sombras+de+grey+pdf+gratis PDF link annotation
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/40660761281.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/11725764630.pdfIn PDF document text
    • http://hasyo.net/files/file/jonumipelumejorexefif.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/47927841259.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/58351571760.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/watijukikudininog.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/bizumutagepulonu.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/jozijotamofoxonu.pdfIn PDF document text
    • https://cardolf.ro/files/90063727051.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c26983fac---bojinafu.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/42768096712.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/wenukomexibafu.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/lokeragik.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/27143894598.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57321268760.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210904012603157.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/tanukizowavomagowifa.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-2/20210902043029141797.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/gopodawubog.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109091501286797.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/laguk.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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 19004 bytes
SHA-256: e2c32527e3b730c64db81c09e0f2dc03cc37ad5e529ec2b7a20198e0df17eb84
font_01_sfnt_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 11104 bytes
SHA-256: 469237216d41b244b3119192d9d5ed1ac7d241d1baec6a1fb2726f4b45d5f381
font_02_sfnt_off0001282d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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