Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd3b678e0844c20…

MALICIOUS

PDF

92.8 KB Created: 2021-09-20 11:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 44dce95dab7cddd9ac8f19c0dbf5efc5 SHA-1: aee8b11fda7b57112b720274a95f6d0106deee45 SHA-256: 7cd3b678e0844c20420e448797fd791114992919c06bed5f99e14b744cc32c20
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external URIs suggests an attempt to redirect users to potentially malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://nomylo.ru/uplcv?utm_term=sword+coast+adventurer%27s+guide+d%26d+accessory+pdf PDF link annotation
    • http://duquenne-moteurs.fr/webroot/upload/files/xegaresemezelij.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/45539748556.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/tekabotorivu.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/watamo.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/1271860453.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/tobibilajenig.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/wowopijorisobidavogugedol.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/zevefutinukexidikuredatu.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/wuwerap.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/fuwudugamisidube.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/56141555458.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148002f0f584---kejosiwem.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/83589013870.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/totivixo.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/92195657183.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/golaja.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/52834212704.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/diloxobeperodilasamaf.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a7d14b2d300a01116507a069f616eb89/nujulituzexozifemirefanuv.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/fexekikusa.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/worib.pdfIn PDF document text
    • http://generaldistco.com/images/file/vefavipo.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/divuzisodoromuxojom.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/datirerutiluvu.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/nizesudemadepevovusubimaj.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_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 10860 bytes
SHA-256: 378b0290f662f8239daf5fdca52cf638010dd657e12c15d023dbd78d7581b925
font_01_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 17844 bytes
SHA-256: a8fd7b5b4a34b43bd900042ef3726c1ecf8985e65c38b365f07f69ec93834749
font_02_sfnt_off00014d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1