Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4188b4e2ba8b256…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 00:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5eefdb84b8820945fd77fbe6cb8baad SHA-1: 205bda66a69d969a2ba190a0e49dada860dd7678 SHA-256: e4188b4e2ba8b256338fe4b1917952124ef2a9f19db129a9d63d4b5a715063a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting or redirector services, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=how+to+get+to+developer+options+android PDF link annotation
    • http://folientastaturen.pl/_data/file/51214571697.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109111117336798.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/71230960937.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/33008461757.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/jotogogazuja.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/59706821339.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/xolikitamo.pdfIn PDF document text
    • https://megashina24.ru/files/files/jukofi.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/xowopixuj.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/mesefevo.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/gugigo.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/fuxukofakevegu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161380d04334f4---45066682592.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358ae366d11---41026510538.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/11024602309.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/nokaruruvukexed.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/madipeliwavinazufidubepo.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/96416757950.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/zuvif.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/damejejanojupuluzegif.pdfIn PDF document text
    • http://korytnica.net/data/files/rajovikulijekubedegowu.pdfIn PDF document text
    • https://renewone.de/files/pojifonu.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/jegufenew.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210912045918.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_off0000c1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CD 10708 bytes
SHA-256: 68afb9450bb4429b10ac79c14ea00a8774909d902e9550e444cb36a1c7ca024f
font_01_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 17520 bytes
SHA-256: 3c2c3f7d745eac7a4e7fa80cfcdb16eb84f16df945996d79795c279d49efba94
font_02_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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