Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1421ad6501813d0…

MALICIOUS

PDF

68.3 KB Created: 2021-09-13 06:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a33d1c5ef81eae90e04924810f07bc3 SHA-1: c3f57e27bb4f40804319efbce6bdafd4be313a27 SHA-256: c1421ad6501813d0ed29418c82d46d3fe6ed4ee75f013471ec0e72ec095ebf4d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains an embedded JavaScript stream and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution PDF. The presence of JavaScript points to an attempt to execute code, likely to download a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=dont+breathe+tamil+dubbed+movie+download PDF link annotation
    • https://cissud.it/uploads/ck_editor/files/vinevezaxewosakakoxuk.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/xatuninuliduno.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/1286368591.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/daguverile.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/jumikaxerufavokatebo.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/9287975437.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/rinojodowotuj.pdfIn PDF document text
    • http://domosplast.hu/files/file/rerarutolaleset.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/bisifega.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/sobom.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/kalisugixobenasewose.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tufem.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/kisuvugomafo.pdfIn PDF document text
    • http://tyextractor.com/d/files/rojawerolunil.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/73505583384.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/moxudim.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/pudolakifeburigan.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131146259d2e---luxirusufaxobetej.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/filenepodano.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/11679067145.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/warutipetunoxufidikot.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_off0000af41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC758 10740 bytes
SHA-256: 02371f9935ce4317b4b554bb61db365f291a1afbc2e46a25a0c216b2a9a1acdb
font_02_sfnt_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 14204 bytes
SHA-256: 2d4c46cbea0f674552ad3da558387cd350e2c12fd23dc9e869bf7ceac70b69ec

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