Malicious PDF — malware analysis report

Static analysis result for SHA-256 68da2e737d1d9268…

MALICIOUS

PDF

79.0 KB Created: 2021-03-31 04:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ec57e490274bcfc29ec009a5565f7df SHA-1: 52de2fdcc1ad5ce864599f4408613ef9159b347d SHA-256: 68da2e737d1d9268d69ebd59cfd974aa47c874578201fc21a5d0c5630665a931
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, likely as part of an SEO spam or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/wix?keyword=california+dmv+written+test+study+guide+2015+pdf
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5fd665d225951.pdf
    • http://ritual-venki.online/html5_header_nav_templatekhh69.pdf
    • http://powerhdniy.space/c_c_tutorial_w3schoolscwegp.pdf
    • http://pipvip.ru/the_lightning_thief_musical_cast_albumscmj6.pdf
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/8c8b1e0c45.pdf
    • https://static.s123-cdn-static.com/uploads/4471099/normal_6007fc9373e52.pdf
    • http://sdfafq.info/rusovegonepajujanpe8cw.pdf
    • https://xovesoxak.weebly.com/uploads/1/3/0/8/130813458/nudilagurikidij_betajazavosaluv_tinefilugar_vibusamidulimu.pdf
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/5937957.pdf
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/nojuxolor-juwenekosif-dizekiki-nupisasiva.pdf
    • http://changepass.online/29876450144ccodk.pdf
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5fcf3fc105f32.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_f8532f664d804f02a39504951c6e4a7a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/52006feb-a085-4d9a-9708-0d2f01fead81/munavalifomudomewubomuwix.pdf
    • https://uploads.strikinglycdn.com/files/ddfe0770-16dc-4f11-9201-9eec41033ae6/aprendizaje_basado_en_proyectos_ejemplos_matemticas.pdf
    • https://uploads.strikinglycdn.com/files/aef88ec0-5f2a-4e8a-938f-330de76f9af7/vupixebafodivadir.pdf
    • https://uploads.strikinglycdn.com/files/582c66e0-0430-4a15-82ff-e22452ee108a/mini_displayport_to_hdmi_vga_or_dvi_adapter_converter.pdf
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_08eb60b3088a4b229a10829b43552a27.pdf?index=true
    • https://uploads.strikinglycdn.com/files/676aa4db-5adb-4786-bfd2-44142adcfb7a/the_hating_game_novel_summary.pdf
    • https://uploads.strikinglycdn.com/files/50be7de2-ca55-4b52-a972-ef7ae9535862/what_is_esl_placement_test.pdf
    • https://uploads.strikinglycdn.com/files/e156aaca-4c15-488d-9409-516aabf460aa/daramuzulafatojisebo.pdf
    • https://uploads.strikinglycdn.com/files/2d7a5724-a5bb-4c70-b167-a38431a068e9/how_to_bake_using_a_convection_oven.pdf
    • https://uploads.strikinglycdn.com/files/2f498b01-1341-4bf8-849f-82ded824de1f/fixokuwumodifosapane.pdf
    • https://uploads.strikinglycdn.com/files/c165af28-5ae7-4dd2-9dc8-6b692d1f4a66/indesign_cookbook_template_free_download.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_off0000f208.bin
a6b267b03d67fdc4cddddc8f63cde63814695ec0c1edb9dbaa9f39019d20eb52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 5968 bytes
font_01_sfnt_off0001066d.bin
d03a72191d9be4c699767e491e8bae6b434e00b7c454d8cd3155dccfc63a4d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 11812 bytes

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