Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20103ec379a7e4a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-24 09:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f40ee9a0a6cb3a2384e502a333ca469 SHA-1: cc2c4502aaba127095a9e247931356c0db347db7 SHA-256: c20103ec379a7e4a8ebc63f83a1792455976607b366520a8db7505c38fa7ea53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://tao-oita.com/admin/upload_filesfile/ramon.pdf In PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/28525808212.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/34122578363.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/zoporobilegaxi.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/tukul.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142106f92df8---62912186720.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/65931950434.pdfIn PDF document text
    • https://udruga-invalida.hr/files/zepozos.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210914_141919.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/kazivabowigusutiwob.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/xizibavuxejixe.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/96809384441.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/79416402352.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109122123219899.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/goribemomoniwos.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/xoluxoloruxabo.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/62339648693.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/47539344323.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/riritutid.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/91698045937.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/5145987868.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/8526839429.pdfIn PDF document text
    • https://athenaeumchessclub.com/ckfinder/userfiles/files/46535516979.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/33423345272.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/metamezexidugad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=untamed+stop+pleasing+start+living+pdfPDF 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_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 20716 bytes
SHA-256: d5c267e275d53144ae9bd8345b24ae733de000e1db66cfba7bc2fe55b3abd9d7
font_01_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 10916 bytes
SHA-256: 7a91e560aa402392d6e28e8285c4314f8aa2cbe438f50a1b31b0ee0f0581d7bb
font_02_sfnt_off00013023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1