Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00e0641fc02f16e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 19:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5983aeec6715c254990e922e173d0b4f SHA-1: 1faa3f1f39cd91d6222e1264c4b3e02493757bb5 SHA-256: b00e0641fc02f16e8520ec8005e0dbc82ce42e7a805a33fe5ab95e076a378325
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=best+android+launcher+2020 PDF link annotation
    • http://michalpavlicek.com/uploaded/file/xujewesufadedun.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/4466694838.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109062347593046.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/xotox.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/70823878089.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/47460920194.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/40107955968.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f2d65ec580f2cc0e8ca92184abbb0847/xowiralop.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/41322696667.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/6485340394.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/78213699633.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/68892667610.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/70313567534.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/nudijekejajigexonomem.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/subofetesorij.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/65124099242.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6a55348e531d8cbf22cf7b5aef0771c8/45487105953.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/42468683356.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/gafuxik.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/89315363489.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/60472491639.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/bulanoteso.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/tulefepiguxekogesazero.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/tuvokuvipakirunugegid.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/japekixiwenekemupexex.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_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 18596 bytes
SHA-256: 5e7a1f2d1b7e26a808c2bef003df0702e65fbb04445b8b1260363834e832045d
font_01_sfnt_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 10864 bytes
SHA-256: e197e2aa93aa2cd4d54e139dd6f92690d49de8d0c25b3bb3a3b2d8f56f54b4db
font_02_sfnt_off000125b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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