Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0de2866a11aee03…

MALICIOUS

PDF

115.4 KB Created: 2021-03-12 17:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25cffdad439c8865f57e39a6377a4599 SHA-1: 23bada828ebff78c5342ce50f39edc7d6f1e5649 SHA-256: e0de2866a11aee03ca963c90ef30ffb4eca2f027969a2ecc0bc784dd1ae27b5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary malicious URL identified is https://soxebez.ru/wix?keyword=numero+primo+mas+bajo, which is likely used to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/wix?keyword=numero+primo+mas+bajo
    • http://sbrf.link/formal_letter_format_for_cbse_class_9th061.pdf
    • http://liolika-rsya.ru/catalogo_cklass_primavera_verano_2020fc7zx.pdf
    • https://static.s123-cdn-static.com/uploads/4390324/normal_60025e2c4e3ea.pdf
    • http://mon-cmbretagne.com/73850679218pwc9j.pdf
    • https://cdn-cms.f-static.net/uploads/4459935/normal_602d54f6c930f.pdf
    • http://znakomstva69.space/95695436828jv57m.pdf
    • http://help-verifiedbadgecenter.com/solucionario_algebra_lineal_kolman_8_edicionajj96.pdf
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5fe859ee3b37f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/04827a32-9fda-49c5-9148-3c79fb687995/21715124660.pdf
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_367dc8b9f12c4c77b8110ad8cff10dc7.pdf?index=true
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_6e8942c183ac4e6e93e53dc4fa9e2367.pdf?index=true
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_98af39b377314c6aa1221751439aeb8d.pdf?index=true
    • http://gewevamaki.epizy.com/barat_me_maal_milal_dj_song.pdf
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_68456cbaab534f6ab853bace7dcbd065.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d2a4802e-5455-4228-86e7-c4ae3ed5353f/73276620542.pdf
    • http://derizarage.epizy.com/morafutewunegejegu.pdf
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_3d07c42960bb4cc2bb563bca3afd2bb5.pdf?index=true
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_d761be587f434a1ab0aed7845253581e.pdf?index=true
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_4231990eb7454120a870197ba78d54c2.pdf?index=true
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_d5ab679be6da4082923fea31ee8d19fe.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016c06.bin
49e5bafe2cfc4d5dfa82e2d1596116aaa48a4442708db4ea4a2783056e3e4804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C06 5116 bytes
font_01_sfnt_off00017d56.bin
cd3d251552400c142a56d85635d9e2b45ce4035af01b947ec1b54eb208bd91ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D56 13560 bytes
font_02_sfnt_off0001a9cd.bin
f7282090e270060608fdc575ded0b184a97243f724fc845514d2e81390c10c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9CD 16144 bytes

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