Malicious PDF — malware analysis report

Static analysis result for SHA-256 187b12f295055aef…

MALICIOUS

PDF

93.6 KB Created: 2021-09-10 12:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 622a744a2e43cc1d04284d8385561d94 SHA-1: bb4fedde73edb2150a95481cd98449de655dabf9 SHA-256: 187b12f295055aefb80902104fe3c3ee11bbc0ad66b41fd281e633f64ed28482
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and multiple external URIs, indicating a likely attempt to redirect users to malicious websites or download further payloads. The presence of a download button lure reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=sixaxis+controller+no+root PDF link annotation
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4c3ce06153c1b781b59b8ff59cbeebb1/xowidixemujigunase.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/56457110349.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/ruvepujexamibare.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/dudimoxotaridubev.pdfIn PDF document text
    • https://limsurempat.com/contents/files/44325227631.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/sojiku.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/fikofixujuwodogopirezux.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dn377hhojhr000uvgf47f5pak1/rexoveref.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/wuxilefadukivoseweripigu.pdfIn PDF document text
    • https://sambelteri.com/contents/files/sapanogozaposus.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/beterajuvofufi.pdfIn PDF document text
    • http://trovas.com/userimages/46996493767.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/73289213049.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210908_231147.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/mugopagexeko.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/21745758764.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/70358100932.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/xalero.pdfIn PDF document text
    • http://gewald.ru/content/Files/butasigubajukegaxefiji.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090715192273499.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/79693702343.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/zepeteziladidog.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/liwolabopizoxogosofekov.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/37685545343.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_off00010912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 18376 bytes
SHA-256: b3b6c76b677302c65643de358fe94c5f1a557b3eb4f35ec6714f9c425c111c56
font_01_sfnt_off00013914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13914 10400 bytes
SHA-256: 2f572dfc96643593e018642c6a0666d910b23a7d3db10a74b352383186bc4a9e
font_02_sfnt_off000150c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1