Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d34ee238206ce67…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 10:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 642fb2892be29412e330d245e40e3771 SHA-1: 907f293451e5eba60356ab71abb31b51c1f50aa5 SHA-256: 4d34ee238206ce6763a772d05114f049cb918e03255e92a83ecf0018012bd593
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, containing numerous external URIs pointing to various domains, many of which are associated with disposable hosting. This pattern is commonly used for phishing campaigns or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://turnwealthy.com/ckfinder/userfiles/files/bijeduwemegojitodezizevo.pdf In PDF document text
    • http://radtel-sport.pl/userfiles/file/bodugesitisunipope.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/55067065458.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/jevogil.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/82599364102.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/jodup.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/bekuvubotedetezod.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/54408583742.pdfIn PDF document text
    • https://esvigo.com/upload/files/68044248683.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75a3348e7---84731694780.pdfIn PDF document text
    • https://ancoraeducacion.com/images/85939258895.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-5/20210905100413519631.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/bc8b408ce6a6bd09264035a9679f853b/52708119820.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/palutusolafudikudi.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/bizupudejirero.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/57684396976.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/57094276573.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/99699796813.pdfIn PDF document text
    • http://contelex.it/userfiles/files/24734245171.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/12850942228.pdfIn PDF document text
    • https://777mto.com/contents/files/newavilojekub.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/mebavidinuxejesufu.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/lorajuwezajorug.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/87779704307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=laws+of+indices+worksheet+pdfPDF link annotation
    • 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_off0000bb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3F 16300 bytes
SHA-256: 4b310517b44a61af570bc794de82e58077c13b4ee16600812bd9543f70e1b17f
font_01_sfnt_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 10808 bytes
SHA-256: 772e4f66c21239d5d92dc112e7bcd9be5e74a9389d9dff2c6a6284f905c7cc04

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