Malicious PDF — malware analysis report

Static analysis result for SHA-256 032b4e8ccae48f2f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 18:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b61a24f7073fd843af75cd80d609a8b SHA-1: d3c5a56c1d823713363cd89c86ca678ba7901a6c SHA-256: 032b4e8ccae48f2fd32bc6ce9be0c07d844e65111dbd10850562d5ab8cfb833c
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 of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to various external sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's used for initial access, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://aspirecambodia-edu.org/userfiles/file/zopofiw.pdf In PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jonopujamuso.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210913_7A5EF4AED9C3317D.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/29635483615.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/todarim.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/melozebokinunufil.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/39823181914.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/26421858873.pdfIn PDF document text
    • http://chayka-svg.ru/files/nupadazurepo.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/63667839484.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc53f3720---xuvofunimanobekub.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/zasunit.pdfIn PDF document text
    • http://seto.cz/uploads/42529231949.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210903105621.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/46035348474.pdfIn PDF document text
    • http://www.buildonhope.org/file/merumuderedawe.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/kumewawufemanolu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/b5egsk8b8mgulml4tvgp0gq07v/mejisisagelizuxuk.pdfIn PDF document text
    • https://bloc-immo.com/images/39440458564.pdfIn PDF document text
    • https://pecintajp.com/contents/files/20738978058.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/8396638511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+windows+10+32+bit+iso+filePDF 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_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 17088 bytes
SHA-256: fb300197fd4ea7372fc22dd7c8a7ca3265bbc8f9cec81417f5c067896a1f73d3
font_01_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 10940 bytes
SHA-256: 3bada0836d2cef760c8edfc22dd96139ca97c8ea63992508a4f484c550329446
font_02_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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