Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2327392f928de8…

MALICIOUS

PDF

85.2 KB Created: 2021-09-13 20:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e28793e7dcc3a4beac3c5414b589a18 SHA-1: 401a8375f5acfa00f276992a34b43c15a4c8b883 SHA-256: db2327392f928de8c5f5d04528bdb6bc41208c1b0dac07cfda94181a1d32abfc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to potentially disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/febebanojirotajivejijupup.pdf In PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/wemuwijikijowabari.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/gufekerexupawotigize.pdfIn PDF document text
    • http://klemanpince.hu/files/file/30199208682.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/67136340970.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/mojixo.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090504215027.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/jijumexagavax.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161312f167ad02---jasojokizerasebob.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/25243243153.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109070627211276.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/12539650965.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/20585204369.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/jononudekojiwabakumodinu.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/jurojebes.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/zasabetipewejivulodipixo.pdfIn PDF document text
    • http://maulich.vn/attachment/files/nojosud.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/99661060304.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/53788374474.pdfIn PDF document text
    • http://matras-devison.com/upload/file/35773563294.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1849ccfe137be2c050e138c744be42d0/48195803390.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/179263212.pdfIn PDF document text
    • http://kezmosas.hu/files/file/65682583962.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/povitiremukagawogamutig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=best+newspaper+app+for+androidPDF 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_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 10584 bytes
SHA-256: ac5ca1ff9ba6aab1a3e054fc0704f0a7c670206595b4b2c38a31dd91d635a547
font_02_sfnt_off00011b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 17180 bytes
SHA-256: 09f2291ae82165d7dad89523ecb7b68df10325c7dbf4f0190797e5a35fcb65cc