Malicious PDF — malware analysis report

Static analysis result for SHA-256 85049afa5cb7bf97…

MALICIOUS

PDF

88.0 KB Created: 2021-09-18 04:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef0dd3dc84b005cf2c1b83c686959057 SHA-1: b1f1bda7afa514c59efe2f874c9730bd27919690 SHA-256: 85049afa5cb7bf97e27f0a6010ab472cc17b1da224b550cc95d177aa932e8d7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=the+moor%27s+account+pdf PDF link annotation
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317907a3de2---matexumudaxabomijo.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/togelagagefituses.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/87491129878.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/putuzapunon.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/37454996031.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/27754024609.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/safivudedumofozaluza.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/nijemulexatepaluga.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/tutekorew.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/kuwizemadipibuj.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/gatigopekovawaj.pdfIn PDF document text
    • http://strap.sk/uploads/files/jukudad.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/zagadiwaxuteke.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/desudagotaju.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/24761856355.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210914090957.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/58042865622.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-8/20210908140855826375.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/14061488309.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/tebitefazagokow.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jesiv.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/71427168731.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/gatujixodod.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/89421269844.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_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 10844 bytes
SHA-256: 5d71452d5f614b72a0a1cc1858449b3dbbc057948087409b952efa5b5bdff17f
font_02_sfnt_off000120d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D2 18844 bytes
SHA-256: a04c3c98b9f96524d021aee6e276c4ea93d393b2edca88dc35b7e64debe72a62