Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f372b8c5fecd35b…

MALICIOUS

PDF

77.8 KB Created: 2021-03-30 03:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e5ee7d02f7acd0bdb928fedcb99cda5 SHA-1: d1f045ff522dcc49d3ac822eb7c3fd55b910afac SHA-256: 8f372b8c5fecd35b55a246e16e2434911b7d1e290977fcda604dba068c901cdd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. One prominent URL, 'https://leonvi.ru/wix?keyword=the+unknowns+band+bellingham', appears to be a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=the+unknowns+band+bellingham
    • https://static.s123-cdn-static.com/uploads/4413587/normal_5fe0c8426274c.pdf
    • https://cdn-cms.f-static.net/uploads/4368219/normal_6014d6195ed6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ginutu/metal_gear_solid_v_ground_zeroes_xbox_one_cheats.pdf
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_be3a575bef614d93be28982f9bfec9b1.pdf?index=true
    • https://s3.amazonaws.com/farefasejikap/wixexupulak.pdf
    • https://s3.amazonaws.com/mivokozibu/information_about_2_generation_of_computer.pdf
    • https://677e6977-fc43-48b2-ac81-16e478c8573b.filesusr.com/ugd/3750c2_69c6cf17c20d4cbcaaae31a6ea9066a3.pdf?index=true
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_f26c812adf844f15ad0492d2136f81ce.pdf?index=true
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_16666e77e53b45e1959ea903cadec12a.pdf?index=true
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_fca2ce73c4f6461d9aa15e3506da8a2c.pdf?index=true
    • https://s3.amazonaws.com/lijopavexanuse/report_damage_car2go.pdf
    • https://s3.amazonaws.com/xenavuxa/12606162275.pdf
    • https://s3.amazonaws.com/dezajok/14068875282.pdf
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_19430fa1139e402980bcdfd977cb17c6.pdf?index=true
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_1bb21995657d4564b4641f4e083f842a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9641d16d-4bdf-4bd8-b541-bf4d4c225342/how_to_record_on_qsc_touchmix_16.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
    • 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_off0000dc56.bin
7f2a7d6cbbd6f3cc9e87c9bf063681e28f44e7664f342288db51e2e7e5a9e528		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 5388 bytes
font_01_sfnt_off0000ee97.bin
746ba133fe715a6de3c10703b825a1a400ff918b90c30357957ee3c9416d5c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 11008 bytes
font_02_sfnt_off00011333.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 16204 bytes

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