Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2e49a6d251d608…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 22:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ae3dc3d019a0d488dd07c230eba795f SHA-1: dac37cfc65301b659988732a7a7afe0cd738ea0e SHA-256: 8f2e49a6d251d6085cdce6c8f731717b76f74d039503d916890ab2e5f7eb6b5c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which point to other PDF files, suggesting a link farm designed to obscure the true malicious intent. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=naruto+shippuden+ep+375 PDF link annotation
    • https://kolbandibileklik.com/resimler/files/33677301753.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/zejomevoxufu.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/wavodokezejiwa.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/93481162108.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/57426478435.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/juxoloniwamudekimawe.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141659f78626---35137209526.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/81881548995.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/83758192477.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/58152239897.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/xibumemexawese.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/96650544346.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144e8b4d1401---wimipefumepomolebiv.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/gawarumifidodureda.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/gefukurexi.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/povozazipuxunisetevupun.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/sovoputepaxu.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/71358297445.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5565379416.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/bifodamanajotu.pdfIn PDF document text
    • https://shidoremicrosys.com/media/85810062322.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/jawumugoto.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/rubakosegax.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/46399348139.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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 10876 bytes
SHA-256: efb7dc724a79b1f44812b3e337c11132fcd2fb07469d3f878e47313509cefe46
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 19668 bytes
SHA-256: a1b76e3dcfa08637d35fae6cd78e7a28ec57af1ab5a6332f30c4020a10dcf245