Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e74ec6c37f11be…

MALICIOUS

PDF

67.6 KB Created: 2021-09-28 23:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb8af2cd8faf39a5040df0097ceda490 SHA-1: 433706abedff3eb8889545fa3b65be24be3187cc SHA-256: 11e74ec6c37f11be0c149b8c71909d7f0645a35e4393164465b954f23351ef08
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a high-confidence heuristic identifying a link to an algorithmically-generated URL. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicates maliciousness. The file's structure and numerous external links suggest it is part of a phishing campaign or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=swamp+attack+2+ios PDF link annotation
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614407ff12d62---7150364796.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210916080926.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/19832066324.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/52740118724.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/xikavinow.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/43898569688.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/16777551579.pdfIn PDF document text
    • http://seamacros.com/upload/file/runonumi.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/muvodajofizu.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/fekamepedebiza.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210919085708.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210925094529_1908646905.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/wuwavaxekumepejozuzoji.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109270817496749.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/nugade.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/kaxozipelazogu.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/kapepumufutiwomudig.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403b1762b96---21678546934.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/kuronibezikujopego.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/59683203330.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/nekewewekirogefikevag.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/78525118206.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_off0000abae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABAE 10528 bytes
SHA-256: 0f9a5b2baef30aa9538868959475cf658d61c8f833f479b4c2c14d2a52086fe9
font_01_sfnt_off0000c3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CD 14724 bytes
SHA-256: 1efa64001943fb3da3bd1e3c93049977c41627c1511757f1187c7d4ae0828c62
font_02_sfnt_off0000e90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1