Malicious PDF — malware analysis report

Static analysis result for SHA-256 169e611d409e194a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 05:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 895c5321425778003afdede8296863fa SHA-1: b55d5001a9c4a1fbaa3617bb598c8390dc54d477 SHA-256: 169e611d409e194acc5ae3c57ebda7bbdc67b6489fddc7e98661a2477cbc055d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests an attempt to redirect the user to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161355a6617dfd---43662761495.pdf In PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/xesoxetutelupok.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/bawopesefunopepekexuwatus.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/kasapusig.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0326f9bcd2a1314fc64d9a1db8546bb6/viwidaz.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/babinuvovaliza.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/wipafipafubezumufozuwulaf.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/86275521300.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/tuwelolo.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/31868405279.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/xebeliki.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jupagufe.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/gonuzozoletaditisaweku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327ef93f30d---jakuladukanofegugurawebi.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/70902112393.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/85145612910.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/15472707990.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/37189498788.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/93267654577.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/vibixanujaravoraferuwiv.pdfIn PDF document text
    • http://gaudi.tw/upload/files/lixuliludaramemuso.pdfIn PDF document text
    • https://people11people.com/uploads/File/xexonilofupesabileme.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210902011306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=husky+puppies+for+sale+qldPDF 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_off0000c126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 10732 bytes
SHA-256: 7f4d1cdb9726a175781502eb9a79289fc8957eeb1b27e4ab292886dea3cc2368
font_02_sfnt_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 16228 bytes
SHA-256: 3e03e717f589d3c60c6634bdb98005fe7840d35e1ce3f32c7a2688a947dc4b55