Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82e201f749a8f6d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 03:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c9622bf385f1b1cc0b19e1b19ff6a9d SHA-1: 665b81da972b842ad7d7afe8f6d98ce340b8acde SHA-256: f82e201f749a8f6d86b0a2bdcd039d23a6eeb675fa4fb24bfe82efc2258e1f43
134 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, which is often used to exploit vulnerabilities or redirect users. The PDF also hosts a large number of external links, many of which are on disposable domains or use UTM parameters, suggesting a link farm or phishing campaign designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=ladies+salon+open+near+me PDF link annotation
    • https://malmospelmanslag.se/userfiles/file/lofedefujeza.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9153cb8f5d5e44df5c8ecc4296077c07/358582278.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/63329096450.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/tawan.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/25047377974.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98827763518.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/87123367151.pdfIn PDF document text
    • http://strandedtattoo.info/file/zamabozumodelaravasid.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/lumuninefiwupap.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/66229878392.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/7999380495.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50fa5d0ab---mozezojejodenaz.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109071728237153.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109092131341240.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/lanitozonekim.pdfIn PDF document text
    • https://n-tlg.com/files/file/fedipulupejojaj.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/35926598912.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/38887087478.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/batazugibufomaxumominoma.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/nekiviwaboz.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/fogevopaxupomebetaziwukis.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/80711999107.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_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 18228 bytes
SHA-256: e5fd58d633c7b075a0a4ef48dfeb6cc58e1bbaf1cb85f19963b9c0e858043318
font_02_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 10412 bytes
SHA-256: c0334f7d3782f543fb419e98bab3a96c15f103625fb8cb017ec95da7e3f70b12

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