Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acc578d840f586c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 06:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07ec49f5d376e97e130e333b561199ea SHA-1: ceafbb1ad26683f2aac655aafbddb5be4539afd7 SHA-256: 3acc578d840f586cfe20b680cfb26c6f78ef640ea14518bb3ecbe90e9cd6a405
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm hosted on disposable domains. The PDF contains numerous embedded URLs, many of which redirect to other PDF files, suggesting an attempt to obscure the final malicious destination. No scripts were extracted, but the PDF structure and URL patterns are indicative of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://coretry.ru/uplcv?utm_term=average+pitching+wedge+loft PDF link annotation
    • http://propertiesforrent.com/userfiles/file///74937624811.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/wizowejanexi.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/87505840720.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/jigijilupituvadinuxota.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/2192668897.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/fulasapobaxekogejodajone.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/lokutemumemilujilavoz.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/64711208450.pdfIn PDF document text
    • https://alohasafaris.com/files/limigoluxi.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210917_80A23A827F8F72F5.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/88209757272.pdfIn PDF document text
    • https://sapporopools.com/contents/files/lukevafifabuxavobugonew.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/95177863754.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/tutuli.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/97178003102.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/88028497584.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/fatipoxevozet.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/kifenitiz.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/pewexonugopupusunoruta.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9178e85df6ba2872d68c20f424dcb330/11155769410.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/50410356424.pdfIn PDF document text
    • https://latework.cz/soubory/jirurasikapot.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/kefubusozijezifebokiteza.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/59501580674.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/dararumefubemogomuvusa.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/27389158251.pdfIn PDF document text
    • 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_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 10864 bytes
SHA-256: 40450c556d7fd05c4e6f66507714f0dfdfcd9661694ed99f6ee62d0f4b06c828
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 17244 bytes
SHA-256: 6ce4e8121f30b813d31a88388579a9235fbbf6c0dd4d14b42ddb1d3c4c88b1cb
font_02_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1