Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cd17d5c8b53ebe…

MALICIOUS

PDF

85.3 KB Created: 2021-10-07 18:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: affd7da258fff046cf023cbe384ab610 SHA-1: b71d961b90f1574a4aa884e9c4e3120d54c5b9cf SHA-256: f8cd17d5c8b53ebe8a69741caa0ceee299eedb478df1694468592e29ada2a319
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the PDF is designed to host many links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://highfieldhousehotel.net/nbloom/fckuploads/file/40875574925.pdf In PDF document text
    • http://tcyy88.com/userfiles/file/2021090920083573499.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/mokekufigupivez.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/malebegujikimukisubolamo.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/19271081218.pdfIn PDF document text
    • http://cke.hk/userfiles/69906314819.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/42548798178.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210908155053_1533550456.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/xukokomatotef.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109291714598072.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/budipuvoximod.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/75977062336.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/bopagudenagutikuwu.pdfIn PDF document text
    • https://kristinanamaste.eu/files/budijariviwurubabado.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/perisunuponutalapefemufaw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6f582cd4---65449659406.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614083e96f89d---bamolinigetosaroni.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109231720073941.pdfIn PDF document text
    • http://dalaichau.com/files/4018078283.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/50592354500.pdfIn PDF document text
    • https://hssanesteban.cl/files/sijuk.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/85276914019.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/vedem.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/69818707185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=microwave+riddle+answerPDF 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_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 10408 bytes
SHA-256: 33edcb9d9f8875fa92d9c09513f5af7c3ae9eba46179d67ae1b86aaae65486a8
font_01_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 19204 bytes
SHA-256: 000507a8a734ea004fe3aaa9d757cd3fb1b9f2d31978a8ab79252451bc54c3ca

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