Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7745bce9c6e1d8c…

MALICIOUS

PDF

74.3 KB Created: 2021-09-12 15:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab3816d2dc00077e7f383e0a0d0d6aa3 SHA-1: 04374e1f136a4ed8e04675c6d3125b01990a5f6c SHA-256: d7745bce9c6e1d8cc0ef1ff688bebf9027f3b803a7616ed87921ad547e12500f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by an ML classifier with high confidence. It contains a large number of embedded URLs pointing to various domains, with a specific heuristic identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL distribution strongly suggest a phishing or scam attempt to direct users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://twfbs.com/ckfinder/userfiles/files/jasilidetataxodiz.pdf In PDF document text
    • https://tectrongim.com/uploads/file/83073229192.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/jixalekifixupakaxanokuk.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210912080746.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/13502405357.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/28688186447.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/68321325614.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/38705268702.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/finajokax.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/doxademuvo.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/kazipimenexu.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/vinefukuson.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/petufavagivudexederim.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/84757289492.pdfIn PDF document text
    • http://prompol.com/media/file/74758634791.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/50737218441.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/lapunib.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/89536539739.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/faluwu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e17134a0649f645d6a3580f6b82fe5e2/jarogufodal.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161337558ef69e---bulomiwukodivasub.pdfIn PDF document text
    • http://gibisch.com/files/files/13894640942.pdfIn PDF document text
    • http://ibb-online.ru/f/file/zakemebitojigejexivef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=historical+newspaper+databasePDF 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_off0000bd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD86 10724 bytes
SHA-256: 7c314dc75c22c2c4b62ece4649f8668c950581e614ac61966bd5a3832f95280f
font_01_sfnt_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 17512 bytes
SHA-256: 49fe023f16b3e11f58766b1aeafe3ee391c3c7090be5fc219913d826103988dd