Malicious PDF — malware analysis report

Static analysis result for SHA-256 3437fe66a71ff9f4…

MALICIOUS

PDF

71.9 KB Created: 2021-03-11 16:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df591aacf5ce1e514885d22fd558f722 SHA-1: da5a775bb088062ad7030b055b05b90ad44a4ca2 SHA-256: 3437fe66a71ff9f42b0f4cd1ba9b26b03617bec337413ee1f46cfda5955f62de
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/award?keyword=converter+pdf+para+auto+cad
    • http://liloleg.iblogger.org/healthrider_h70t_treadmill_disassembly.pdf
    • http://gojoxoxuda.22web.org/subclase_alismatidae.pdf
    • http://fulukegoror.getenjoyment.net/fuborosigilusoravuto.pdf
    • http://pujesuwidiw.22web.org/nazaxamed.pdf
    • http://kolaxowivod.22web.org/voluberakateres.pdf
    • http://raxawevamavox.getenjoyment.net/neet_syllabus_biology_2020_download.pdf
    • http://pifozuvarivin.22web.org/bugegurodukileso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_57dbd7b552f64e6aa1cb65dd543ba95c.pdf?index=true
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_734cd799809344659a4010b9be9ce42d.pdf?index=true
    • https://s3.amazonaws.com/buxoparadazegu/gerorisuvodalavugito.pdf
    • https://s3.amazonaws.com/nuruvapozixix/gepupugipatina.pdf
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_a8c30440188a4c1c84413224c16966cc.pdf?index=true
    • http://suxanovovogemi.rf.gd/how_to_calculate_actual_power.pdf
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_ae6056de64d049cfb7dd3e085ea52bc4.pdf?index=true
    • http://baxewape.myartsonline.com/como_crear_un_archivo_txt_en_la_terminal_de_linux.pdf
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_36184eb38ed64a1caae69e97fc69cb22.pdf?index=true
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_75677f95df7d4bcba898c762261a00f8.pdf?index=true
    • https://s3.amazonaws.com/gopuze/cuanto_gana_un_diamante_en_amway.pdf
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_23644f56dc104c78a915a9c684b3b938.pdf?index=true
    • http://zupitatip.atwebpages.com/kitokaroxu.pdf
    • https://s3.amazonaws.com/kefodek/types_of_psychological_evaluation_tests.pdf
    • http://tononuzaribiw.rf.gd/aghori_full_hd_wallpaper.pdf
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_f0d2cb2df5824776879cd383f739109e.pdf?index=true
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_1fc49fb73c504328b59bd2441d712e29.pdf?index=true
    • https://s3.amazonaws.com/widuxade/wigiwidekevamevajufamog.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_off0000df80.bin
7d78cca303510d71862d853eb8fcf8762a454d6f102429ec234c13d4a474b425		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 4904 bytes
font_01_sfnt_off0000f048.bin
7d200c4a90bbc09d677238909d6970d356e07baafd465825cdabc6e45eae9221		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 9916 bytes

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