Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab66873deb9e329…

MALICIOUS

PDF

84.6 KB Created: 2021-04-02 18:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d89a6a210192f4a779a69e8978be63ee SHA-1: e27fc38bb538af663693c34d6863fdfe1d35f164 SHA-256: 3ab66873deb9e32976a39db4f20d4f92080fef32cccafb29f72bf842af324db6
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing or malware distribution lure, indicated by the presence of numerous external URLs and a PDF link farm. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic point towards an attempt to redirect users to malicious content, potentially for downloading further payloads or phishing for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=fifa+mobile+soccer+mod+apk+unlimited+coins
    • https://cdn.sqhk.co/xogovofofi/b7jhjeK/world_basketball_challenge_unblocked_66.pdf
    • http://sun-italy.space/29275902936hlngd.pdf
    • https://static.s123-cdn-static.com/uploads/4408704/normal_5fe210e15366a.pdf
    • https://cdn.sqhk.co/duvapegoleva/hgibiju/fajinigoruwuvavulumuvemo.pdf
    • http://cafe-cok.ru/loser_by_jerry_spinelli_chapter_questionst3gxh.pdf
    • https://cdn.sqhk.co/pevipulakas/d4ciQja/fusosilu.pdf
    • https://static.s123-cdn-static.com/uploads/4460063/normal_5fe2f7205b49b.pdf
    • http://getsol.xyz/ch_14_hw_concept_map_comparison_of_somatic_and_autonomic_nervous_systemsl3sd8.pdf
    • https://cdn-cms.f-static.net/uploads/4470543/normal_6039fcca1551d.pdf
    • https://cdn.sqhk.co/nelufebo/uiehdgf/86655991829.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/woxojuxafopuv/liberty_bell_march.pdf
    • https://uploads.strikinglycdn.com/files/3e583f19-9683-430c-84ef-d338f05f01e3/beginning_python_from_novice_to_professional_third_edition.pdf
    • https://s3.amazonaws.com/mutirexa/pijel.pdf
    • https://uploads.strikinglycdn.com/files/1d5f2cab-8d33-4b5e-ba72-19253169d03a/58816411588.pdf
    • https://uploads.strikinglycdn.com/files/32edd64e-cbf2-49e6-885b-d9f858b1966c/nuvusu.pdf
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_9fe4e37611f84d148b13e248446a06f8.pdf?index=true
    • https://s3.amazonaws.com/jazamerijekufol/modelojuzujilejomovexaj.pdf
    • https://s3.amazonaws.com/boduxatavepe/bitlocker_drive_encryption_windows_7_free.pdf
    • https://uploads.strikinglycdn.com/files/55568159-7faf-41ca-aa47-c5f48eb4cbf2/el_proceso_de_la_investigacion_cientifica_mario_tamayo_y_tamayo_4_edicion.pdf
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_3211710c20fa44afb59ce94dc4104cc2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fefbbb2e-350d-40f5-af72-751d77d61446/weregijatu.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_off0000f13e.bin
f2e593f6d85cae19a26625ab0d4d41aecc3678dbbd9c42dd7f9b5c2fbfb97abe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 5460 bytes
font_01_sfnt_off000103b9.bin
ddf5bf7ff03567b106a16933aa64ed912356985b9a970040801a8e17d72daec8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B9 13276 bytes
font_02_sfnt_off00012f4b.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4B 16204 bytes

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