Malicious PDF — malware analysis report

Static analysis result for SHA-256 78591b4db421be8b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-09 11:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b36aea7ff079c3e6dc129c3ef6b4557 SHA-1: 0401a8799637393dc3d235ab245960d0e7f5b13d SHA-256: 78591b4db421be8b933e50be02e1ca57b95c618de95c6613eb9f4be3285a90a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or redirection to malicious content. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/lezobise.pdf In PDF document text
    • http://itkaufmann.com/images/fckimages/file/46078118299.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/81075767800.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/11755419334.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/rijazazoxivi.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/kirazosenusupusi.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/97908275007.pdfIn PDF document text
    • http://eternaseguros.net/files/files/tisitabowedevaranusuboxad.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/40308298315.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/29362884198.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/76224316061.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/11931285333.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/15390968263.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/5737614807.pdfIn PDF document text
    • https://capecoralliving.com/media/file/52274166625.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/77020301614.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/lalum.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/fidafigagefogijodipo.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202196912178004.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/dizekuj.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3fe379a61a140acaf6b1764bbb28b943/wavuroj.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/85436870077.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/76350488583.pdfIn PDF document text
    • http://falerisztika.hu/tmp/famizerisonivalu.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/sozulizabesori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=change+album+art+androidPDF 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_off0000bdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD0 16592 bytes
SHA-256: 7f28d32c1c9651117935e73c3bc7badc42abb4ccdebaa4818badc83eb29dfe1c
font_01_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 10796 bytes
SHA-256: ee0fae4a43efeebe9c5004d55dd554d79be3d677a4cb053aeb2e18b49fa8e822
font_02_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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