Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d15c9205741d18f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-29 11:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 76b9a200e09574e391d7da30b54b3556 SHA-1: d1b571218d2078d22b65dbfbc2aa67042e16e1f3 SHA-256: 8d15c9205741d18f121819ae2dccc616f7ed4cc13c8486eee0107a88762be017
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=android+18+xxx+comic PDF link annotation
    • https://hohsingfiber.com/ufiles/files/4742302556.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/20935958326.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/40859738451.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/revaranolikugopurisuvilex.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/valebimokaroloxoramiw.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210906_79735C5C8F7429F4.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/jemonugivubunizu.pdfIn PDF document text
    • http://upakuika.com/img/file/zinusumotutujumided.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109260702131856.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/32563737751.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/vozapaganolilu.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/wuralisosaxowezi.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/93396076190.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f119ee32c1---tikesorekawotololasiji.pdfIn PDF document text
    • http://arablift.net/userfiles/file/kapozofirokedivemitome.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/80140952253.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/zakis.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/37869305505.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/pututawomun.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/11043029027.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/lirunipemalojebovupisewab.pdfIn PDF document text
    • https://nada70.org/userfiles/file/55361650576.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/fizexikogelorela.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/93045317053.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_off0000b522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB522 10268 bytes
SHA-256: e8e8bd45dd2a52287b34154faec06d325323ea7b9cd9e5b9a1804646dca11242
font_01_sfnt_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 18400 bytes
SHA-256: 74a4725d8f3a8f32e301abe2d297eb8c3abc570e2a2f457eea035ca300e56406

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