Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cee74b58b2ed86…

MALICIOUS

PDF

68.7 KB Created: 2021-10-06 12:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: abebbafea45884af856ac4d386ee5a06 SHA-1: a01555bca4674253ceabf1de33f0c2f25f8a1afe SHA-256: f6cee74b58b2ed865ac3f99c13f907fd6bbb7b392b33e8e987a895f9d918e0de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to potentially malicious sites, likely for phishing or malware delivery. The presence of many unknown reputation URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://hiddencliff.kr/FileData/ckfinder/files/20211003_1894B7AD5FBA1BC7.pdf In PDF document text
    • https://kenhquangcao.vn/uploads/files/jowulawemunadojeju.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/30441596237.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/68587293680.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/wupasunego.pdfIn PDF document text
    • https://razredna-nastava.net/files/dibexubafi.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/64547025080.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/55924551235.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/88240473229.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/35275554899.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/saperupaxuji.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/kurudonufudirapotad.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/30756603970.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/42871641075.pdfIn PDF document text
    • https://seikai.jp/free_images/files/73962725919.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/dd5ee568c2dcd1d8de863f519a4f3ea9/99116006140.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614f385bc30e0---liputerunimadisasuvibonif.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/kevifajisuruwokesasaw.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/41756268231.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109241154519286.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/sedogepopogira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=when+to+use+an+or+and+in+a+sentencePDF 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_off0000b02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02C 14784 bytes
SHA-256: 37d2da4459ab18956db3e53b00c8d9b8f69034573282dc0c9a38e395d2942edc
font_01_sfnt_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 10512 bytes
SHA-256: 938f01e607cb94a7c4f6e46329e90bec7957ec52c27c03699dd42d83c6d2d740
font_02_sfnt_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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