Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2671977e94fbd2a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 13:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27346221acfeb497fef55926971132d1 SHA-1: c347bb7986902674ed8ab5833e3c1bfb28d7f978 SHA-256: e2671977e94fbd2a63ebe1944ec07441b4ad339427be1bfae81cc4fbe4e514c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://nomylo.ru/uplcv?utm_term=physics+plus+one+notes PDF link annotation
    • https://taumed.kz/upload/2021/09files/2109041613197343993l47h.pdfIn PDF document text
    • http://wwstationery.com/files/file/sitab.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/tumoxawunaluwef.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/menokekododofiz.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/2110995985613f11564b2a4.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/xuvivalofezezoravenijopep.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/pexikita.pdfIn PDF document text
    • http://hkalc.com/userfiles/bifupi.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/sedogigoxosixu.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/33549151340.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/mofata.pdfIn PDF document text
    • http://industra.sk/userfiles/file/1871205245.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/piresomimetigopizaxub.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e73b2f827---xuxadigegivebul.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/jalitozakemuwagenib.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/21483106943.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/vevin.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/mepuvebepo.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/49033903382.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/kubedezewejod.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/81269274582.pdfIn PDF document text
    • https://priscar.com/documents/files/21152942959.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/50642498747.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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 17560 bytes
SHA-256: e9fcad0eec9ca66c896ab0a5795e038622cb71c452ef517a91c7389b6f5935f7
font_01_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 10424 bytes
SHA-256: f051867a4429db5c206a515d98ff59f1eec6619aa8f8f0ea0a3729ab0ac1eb06
font_02_sfnt_off00012733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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