Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f92e2a40473be4…

MALICIOUS

PDF

76.4 KB Created: 2021-03-12 15:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06b4b890c06d12804777e6e3c36080b8 SHA-1: 43add4e09b023c799e9a23702cd275a8e9cd5f53 SHA-256: 91f92e2a40473be47e42ca70813a4d1e82eb248ac72ee8ce7b95a8a00b65eadf
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links. One of these links, 'https://soxebez.ru/award?keyword=history+of+great+scientists+pdf', is flagged as an external URI. The ML classifier and ClamAV also strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated, but the presence of external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=history+of+great+scientists+pdf
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5fd9f8ed124fe.pdf
    • https://static.s123-cdn-static.com/uploads/4421039/normal_5fe1b3fbe3d23.pdf
    • https://cdn-cms.f-static.net/uploads/4451348/normal_6018ca9f96a8d.pdf
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5fffb70dc295e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6e5f46ed-51f4-4538-b817-ef0aed88aa03/formato_apa_de_una_revista_ejemplo.pdf
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_24605a7840a7454facd4b2f05b50cd4b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6018d4fa-f64b-4781-b12e-278a03190dc2/aircare_space_saver_evaporative_humidifier_filter.pdf
    • https://s3.amazonaws.com/busutafitufe/womadijobave.pdf
    • https://uploads.strikinglycdn.com/files/e7d6bdcf-09ad-497e-921f-1a4fe512967e/tascam_dr_100mkiii_case.pdf
    • https://uploads.strikinglycdn.com/files/0f7d6d17-b13f-4de1-a080-a365e2a9c7b0/what_is_figurative_language_vs._literal_meaning.pdf
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_c7e02aca0dec46288fed21e84fcaba06.pdf?index=true
    • https://s3.amazonaws.com/nufidibodudulad/6875957494.pdf
    • https://uploads.strikinglycdn.com/files/edbe1269-ff08-4d2a-8110-097c74450999/28137850805.pdf
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_78b471082a71463bac99c174f5c591a7.pdf?index=true
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_b0b5bcc1e0b64658949147738b3c74c2.pdf?index=true
    • https://s3.amazonaws.com/lerezazo/computer_networking_beginners_guide.pdf
    • https://uploads.strikinglycdn.com/files/e4221194-5cc0-4eb8-8d7e-ba633594412a/como_hacer_un_organigrama_de_una_empresa_pequea.pdf
    • https://uploads.strikinglycdn.com/files/a3c0ae67-bc95-4144-9ecd-16779b55e9b6/where_is_the_garbage_disposal_reset_button_located.pdf
    • https://s3.amazonaws.com/sejakopa/impedance_audiometry_test_report.pdf
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_db23c9e134a248be858461577e55148f.pdf?index=true
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_df195163410748038a16a7f7e4304949.pdf?index=true
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_217ea0bf836046c7a5cde1e9cfa0b20d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3677a94f-5400-428e-8936-8f24893e7594/nolivudodibilogepafipanen.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef36.bin
be82674b9f7ecd78402c667477eb845dd0e90438f55f48c87fab5b079b94f725		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 5352 bytes
font_01_sfnt_off00010186.bin
5b1fd308de94fa55483acc26066b091aae3cbee291a0a2a3fd0fc3787b9f91c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 10092 bytes

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