Malicious PDF — malware analysis report

Static analysis result for SHA-256 483d4b0ca59b1d6b…

MALICIOUS

PDF

87.3 KB Created: 2021-09-22 10:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe1a48ecc1160b23eb4dd371cc9a4b1e SHA-1: e7d3a7ea4a9389647dd0bfad099bb6f3d04b1bca SHA-256: 483d4b0ca59b1d6b9ea4dbced4ebdaf35cb57d472201268b5679206f8a7cd64a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=keeping+up+with+the+kardashians+season+18+episode+1+123movies PDF link annotation
    • https://kuraniterbiye.com/resimler/files/15050643719.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/wiwozag.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/5070772339.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/vozuxaf.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/429693102.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9444632601.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/71042402035.pdfIn PDF document text
    • http://vce34.ru/attachments/file/27952380914.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/6000979818.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/rasutititofopunetewem.pdfIn PDF document text
    • http://edituj.cz/res/file/84500875290.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/86808789952.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614297f85dc37---63333404568.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/mosikokuwajolazogis.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/zunudenidurorotogoko.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/65537828127.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/74279668122.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/fepaxixumazirevokewipoju.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/wiwipuwurobagotirokejegot.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/46765815636.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/12448322969.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fesajakefigodazif.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210914031144.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359684195bc---texifozupogug.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/81008870498.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_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 11680 bytes
SHA-256: af2c799f2107c54be71a0b95b9594f03c27471232cb4141c87290821084a13c1
font_02_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 18212 bytes
SHA-256: 753383fa1fb63b7b36d37bdbacd525e983923181730fd7caac5e3154b239c9b3