Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e580f6257652646…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 10:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d895b02469c05fd6547c7a8e3b2708d SHA-1: 4d5672f7a08a3892c7559a5531eeb7daf2bafc71 SHA-256: 1e580f6257652646069622abbd0ae44e1aee5012a8a56bad97b4ac616d6ea86d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many with 'utm_term' parameters, suggests a phishing or spam campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=knightfall+ar+apk PDF link annotation
    • http://dcbestwings.com/uploads/files/43031983731.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/liwasobotedeluse.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/89649594489.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/91705870305.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/25344827646.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/2613514622.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/18183939075.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/kaxadunonukogufubuxore.pdfIn PDF document text
    • http://cjpharmtech.com/upload/files/porexemik.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/52108392239.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/fokisujemotegebir.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/26928885062.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380cfeb4aa0---96532587779.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/8598634357.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/28574486263.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/palet.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/97ef394e3e66da38acd00bcf849966ee/75824561538.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/xexasuburulogefolumoforov.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/lifulalozexutilelelukeb.pdfIn PDF document text
    • http://szpk.hu/_user/file/78176040461.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/28412871615.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/57074064897.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/vamikefekib.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_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 21516 bytes
SHA-256: c56619aaf1691cfe311c898fe65cea2b8ccc6c63e5339340a98309743d23bfa5
font_02_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 10300 bytes
SHA-256: 614c8f286b35d773cb92259c2d9293654fc33c3b99adb30a7f58751be6ce3e2e

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