Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c281bf6c60916b3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-16 07:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5fe2d9c3e55647a4d318f861680d47fd SHA-1: 6b1701f28241b521ccde503113b109d05731d57e SHA-256: 2c281bf6c60916b3e3a1f5365260b29695e9c48991f89fead4801ce4abbf6f14
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high-confidence ML classifier flagging it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using many distinct hosts with few links per host, suggesting an attempt to obscure the true malicious destination or distribute payloads across multiple sites. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=cool+math+games+parking+fury+1 PDF link annotation
    • http://quinta.cl/upload/files/xixixenasedikotop.pdfIn PDF document text
    • http://insei.eu/userfiles/files/lumakimos.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/mibitopixore.pdfIn PDF document text
    • http://cobmedia.hu/include/pabutiralanudepox.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/92087336175.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/panivese.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/vijefizewadalutonumos.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/tixesunarosikigokoxi.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/42526546803.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/43121081110.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161332e2c8ae11---92497582673.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/2681407642.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/xufunivo.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/fazulojiborolinuxo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/r045act25crn5a4rsje5kil704/gupumigezifa.pdfIn PDF document text
    • http://klinok-saintp.ru/files/jobizupatijilutusuzase.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/45383095996.pdfIn PDF document text
    • http://epmachine.ru/d/files/vikes.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/45648226840.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/53518613496.pdfIn PDF document text
    • https://maturana.cl/upload/file/49129599038.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/48377331660.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_off0000b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 11192 bytes
SHA-256: 77020ecde748afaecffb6f1cc635f1cfbf028716a5dddaecebe93ddbdcacfa3c
font_02_sfnt_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 14484 bytes
SHA-256: 8e61508b8e8455475e16ceaf1e3add90edbbee7f83f31f7add523557841e9143

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