Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d72be67a717fd8…

MALICIOUS

PDF

86.5 KB Created: 2021-09-15 09:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d15f46120174b87d9c2294b64088b866 SHA-1: d1ed0096fadcb4cb5c51e56817309f02dd1476f3 SHA-256: d3d72be67a717fd816394a3b310cfde8191b4810219c9c0f53cb3a40303771ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm and uses an invoice lure. The presence of numerous external URIs, including one pointing to 'ketchas.ru' with a 'make money' query parameter, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ketchas.ru/uplcv?utm_term=make+money+cash+rewards+apk PDF link annotation
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/27076596550.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/gajeza.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/40502915781.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/13981692248.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/50453480439.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/65549415698.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/fadesolopalajoboxawix.pdfIn PDF document text
    • https://renewone.de/files/95548422450.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/zibamanunopovodal.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/gadegikibexiwaji.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/wiruveguxudi.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/vizitibuxorexajowomake.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/malode.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/rarivowevovog.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/73431953391.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/48863595784.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/74909504754.pdfIn PDF document text
    • https://megashina24.ru/files/files/90653670736.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/lb4d0tiot26mkiu1kfv84iep71/givegipabuzakivub.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202199203633404.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/8857859072.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/47198460200.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb548e1c1---39621880345.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/toxamutimojorude.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_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 10828 bytes
SHA-256: 67e3f31c9656193c74fead7095b6ce7bfcc2414e08c002d55e56c34de4a55be2
font_01_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE6 18504 bytes
SHA-256: 3f3ec3f600e9f2001ccb6988a6055bbfdf27f3d0cc4c6dca04c392f5fa375fe5