Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e06072d00cadb63…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 03:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 012d225d5ac0b09cc5ef92ce17563a55 SHA-1: 1608fcad3bb2b193104e2f6604da89cdb771cfc8 SHA-256: 5e06072d00cadb6345a9c1d96e47692ffe159366bf55d017c733c0fcb50cdb42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings point to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://xn-----elcksuhhemsi4e.xn--p1ai/files/files/8121296130.pdf In PDF document text
    • http://saluteebenesseresas.it/userfiles/files/23475006742.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/17007701391.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210907_085007.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/wikasawugoviv.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/11143216513.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/gadijigipaxutuga.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/39618557975.pdfIn PDF document text
    • https://ikansambel.com/contents/files/62004648104.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/53826125059.pdfIn PDF document text
    • http://belovosushi.ru/files/ralulavavexedekewopaz.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1450dff0a---dufojukoxuvefunu.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/rosupelolosuwu.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/renukinuvimarobuv.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/77224390788.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/64707310692.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210913_081629_190.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/38625416406.pdfIn PDF document text
    • https://kimcert.com/E/file/gituselawed.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tuvaxufij.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109060703095776.pdfIn PDF document text
    • http://oilspecchem.com/files/tolovevuzasetiku.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/pomemoxebixigenas.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/4812733884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rootless+pixel+bridge+apkPDF link annotation
    • 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_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 10840 bytes
SHA-256: e82dc2bd7b4dd9f8347b60d091aa03dce713584052922ce5915ccfecd461238f
font_01_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 17736 bytes
SHA-256: e730aa1a58ce2d507d654906b19acea3c4bedc105f813241b62776d850d8e420