Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6bf35ed0ef4537…

MALICIOUS

PDF

72.0 KB Created: 2021-09-22 18:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 413203a3f57caca1e424aced9f03d024 SHA-1: 76e730de1c6a115cd634a4457fa9f6276648bea2 SHA-256: 2b6bf35ed0ef45376a61d763bc522cfbeadf3142023bffa557934d535df152f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to download potentially malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest an attempt to trick users into downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synerhu.ru/uplcv?utm_term=download+appstore+for+android+tablet+free PDF link annotation
    • https://telechips.com/ckfinder/userfiles/files/jisufowexuputamavitomat.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///91399064024.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/21141693860.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/35129099254.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/sovapuwulojapox.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142da14ab4c4---69402073307.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/lativavuxan.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/26817399908.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/23892385832.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/zinozevuwiwelisirisepugi.pdfIn PDF document text
    • https://isosklo.cz/uploads/pavufinixomodujim.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/27441915128.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/kenenaxu.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/2703611331.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/riniwitana.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/66479874740.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/kidepukefafuxamilit.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/zasukilubaborukifebadivid.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/binatolevozuselutadusil.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/36781747770.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67608897688.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_off0000b837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB837 10716 bytes
SHA-256: 20fdfcf18be77be7f54ac36f173400df7bc33af2e0bef56d4502f39e292c140d
font_01_sfnt_off0000d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C0 16148 bytes
SHA-256: 64b4c7ddb708b72f1137b30623525398ac942accb57a3f477200454affbad5e8
font_02_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1