Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcefde6009e3d00…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 21:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b88bbee5571213caf00434962eaad6b0 SHA-1: d3f49d975b2f000a9ce33ab935a1572599377a48 SHA-256: 5dcefde6009e3d005ee19dc0f15238e56008f156852101d9ab09c80395c8b4c4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URLs, many of which are embedded within the document body and point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating a link farm on disposable hosting, suggesting a malicious intent to redirect users or host malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://inwebjor.ru/uplcv?utm_term=second+derivative+of+exponential+function PDF link annotation
    • http://newkontakt.ru/userfiles/images/file/55414038330.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/50585406921.pdfIn PDF document text
    • http://terminsk.by/pics/files/57302427730.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/kegapumaw.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/guxejisenoku.pdfIn PDF document text
    • http://parentini.it/userfiles/files/46679084430.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/tibif.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/lotijolupiloroju.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/76065615060.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/wekakijisigedewedi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161303e7ca2dd9---xuginarajapesomeb.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/63791694678.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/dokegud.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/49630431130.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/43318300538.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/fabuniwimuj.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/3999432787.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f292387de4---34981615733.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/24061644994.pdfIn PDF document text
    • http://ore-processing.ru/d/files/wunuben.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/bimasejuwojalu.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/95511445310.pdfIn PDF document text
    • http://polletnv.be/uploads/files/kipepam.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/4721245470.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/58902529645.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_off0000b606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 10788 bytes
SHA-256: f7a728d468971ce750fcd7b767bcf9b4d1b05624f9a55b55c2a4088a431aa4d7
font_02_sfnt_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 14876 bytes
SHA-256: 346e7d190de52aa6f50a7974ca02507ea3345027296a33955d437537ba93b0cc

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