Malicious PDF — malware analysis report

Static analysis result for SHA-256 185022bc849af882…

MALICIOUS

PDF

117.1 KB Created: 2021-09-08 20:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22570aa80d720a44e23d25f1195c457a SHA-1: 1d0d852219d23e5a04d44c33a6897c9722ab99ed SHA-256: 185022bc849af8823a8376c480a73297cec5c908668ac608f2a434c17dacfff6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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, with a heuristic specifically identifying it as a link farm on disposable hosting. This suggests a phishing or redirection scheme, likely intended to lure users to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://www.barbazan-debat.fr/ckfinder/userfiles/files/pototomezugof.pdf In PDF document text
    • http://www.icf-plant.com/files/file/muwemabowewixum.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/24812232465.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea0339d199---52351211257.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/zigezudoz.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/67168966066.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/busetebo.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109022018487737.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/tamefububazifipi.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/7015938354.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/suxasilivezezumafirosut.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5680808142.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8bce3edb3155957a62f5234f77b4038c/35678204702.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/59727984280.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/25963171861.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/90491561013.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/gozekulawusugorunozi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/nibirorigosomizadadagilev.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/95837558307.pdfIn PDF document text
    • http://hagithanh.hagigroup.work/data/media/files/kulizisijabipigoj.pdfIn PDF document text
    • http://texmet.pl/userimages/file/96798503053.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/vudafinuzotizulimekitojul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=technical+leadership+and+the+balance+with+agility+pdfPDF 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_off00016035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17847 19728 bytes
SHA-256: e5c77f4db2c913260d2d517ee4d9e80c73ff3b7185d0f5a8e09cd35cafdc4d37
font_02_sfnt_off0001ac8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC8D 11084 bytes
SHA-256: a505be78ea85e9685b6cc123eb43e71065a3fa456fff37ac265a1809341d0b23

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