Malicious PDF — malware analysis report

Static analysis result for SHA-256 682fd183f2f7626d…

MALICIOUS

PDF

76.6 KB Created: 2021-09-24 06:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9f29512f28f38aa4033c6dc858a5af2 SHA-1: 55e12e983defdfc87336545e5401eae47013e6c6 SHA-256: 682fd183f2f7626dc0900e0dff96be1bf7661b384c5cde2f039500cdb062dce9
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' and an ML classifier indicating maliciousness. The document functions as a link farm, containing numerous external URLs, many of which point to potentially malicious or unknown domains. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is likely used to lure users to malicious websites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ewdel.cz/ckfinder/userfiles/files/37462478405.pdf In PDF document text
    • https://kisikana.hr/userfiles/file/selovezoderupolu.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/sujad.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/62400155477.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/59047289100.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/dameni.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/vasoniji.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/gogex.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/refuzerobas.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a5ece4ed0b640335f1081522c98e1c57/26015732700.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/wazolikivubezivetusinolo.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/38442312282.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418e1b1fce1---29245528885.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/49644405319.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/50510339788.pdfIn PDF document text
    • http://exima.kr/userData/board/file/bopufe.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/5717599900.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/nuvef.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/wikopoxemegotokixalaxeke.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210916130705314557jr2tg.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/34456297870.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/28858284196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cara+menghilangkan+iklan+di+android+tanpa+aplikasiPDF 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_off0000c8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B9 16356 bytes
SHA-256: 2e8b8f32af9b2d9a4fa4e1f1d1caa4ad9dc2da946e4251c073547995f1e17af2
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 10964 bytes
SHA-256: 8bea6144a0d203434d7773778b44b8a981a102d4a48608e55b2556f6890bbd1a
font_02_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1