Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ecceeca9ddcdf6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 09:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 80be7106430c8cc3d2158e017c0a3c92 SHA-1: 3a7dc4b10ac388832398174253411b12c88fc5a4 SHA-256: 27ecceeca9ddcdf62aac581815c498a38470cea48d85d90ac19274e995d56291
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=the+package+conflicts+with+an+existing+package+by+the+same+name+firestick PDF link annotation
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/lowunajumexurevogonexake.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/zixarekemusaj.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/sumane.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/67670202937.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/47129410809.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/juwakil.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/sasug.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/11795585312.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/83629049525.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/kapuvu.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/fujinusivefeliterib.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/zuvotosizobuvujufesa.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/xejigupelewiduwatogexunaf.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/82301062910.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/94048512746.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/ruvarumel.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/gaguwukurukadado.pdfIn PDF document text
    • https://bunianco.com/other_files/File/raruwufedogosemaj.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/88610879509.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/39944784257.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/42363839526.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/tuwivifupoje.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/jemibuwipefatigawabusixin.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ju32c0v83gudegtlj0pah9vp32/31057984070.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146ca87494ee---69117951277.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_off0000b121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB121 11424 bytes
SHA-256: e24c5b63b5b0d585a73ce63e6bdae7878a975bce24982bf26b45d4bd4aad2058
font_01_sfnt_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 15892 bytes
SHA-256: 08efc5b1b79d8c2b1d0b0ee2a02aba016a7b6658da486d57c8cc2f08d67d51d8