Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ef0f18b1faa6ce…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 23:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1a38782afdc1574fbb24311a9ef4d66 SHA-1: a765e292cb36062f6574a1262e841197226b9d22 SHA-256: 36ef0f18b1faa6cee0c155a86972d246ff592b61f2ad28b107d07d1398ff9b51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to distribute malicious files, with numerous distinct hosts and embedded links. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attack pattern, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ljlconst.com/admin/images/file/84321603931.pdf In PDF document text
    • http://360global.ca/userfiles/file/dezajabemiximovirizina.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47c91c7ed---wifuwubokezikixo.pdfIn PDF document text
    • https://ptogel1.com/contents/files/14706510673.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/gosasonagidamum.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/30938456271.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/denumara.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/lepolobuxaluritasowos.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/rufol.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/xomake.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/53auiu7gik7ucni60riho5t6s9/22127245970.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/34870585839.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/zifovoxufozadov.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/nopebebazavufo.pdfIn PDF document text
    • http://rc-modeller.se/images/file///xevutopefesoxa.pdfIn PDF document text
    • http://xiao-bao.com/uploadfiles/fckeditor/20210902/file/16305817064453.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/83730265567.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/wubulus.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/9964036771.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/76246234959.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/66654958004.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/gasifesuzijesidi.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/letologatoka.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/wonoto.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/18088134993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fortnite+season+7+apkPDF 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_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 10320 bytes
SHA-256: b439e888d8ab04165087ff055fb3a69714578a72a2c4aa32145f7c094f2b12a4
font_01_sfnt_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 18452 bytes
SHA-256: 951a92a7668d65f4db734f5a51e7340b977d806ca8ac56fb2543e0cfa1b756dd
font_02_sfnt_off000125a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1