Malicious PDF — malware analysis report

Static analysis result for SHA-256 a249a7fb0e503188…

MALICIOUS

PDF

83.5 KB Created: 2021-03-13 23:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 905dfd563f2bea061c763c137ffdcd15 SHA-1: 20e19685b767cbe2973842e9fd5092c802389e51 SHA-256: a249a7fb0e503188d80bd9f68e643c4fab8e0351f206ab6e8b9e2a481d82825f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of an SEO link farm designed to drive traffic to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/award?keyword=addition+and+subtraction+rules+pdf
    • https://dalagusixofu.weebly.com/uploads/1/3/4/8/134853238/36d09c8be35f42.pdf
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/3401827.pdf
    • http://winsl.space/65118050373sylq1.pdf
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/2f20ca80872.pdf
    • https://zakazorexan.weebly.com/uploads/1/3/1/4/131407051/suzozeferepo_babenimolof_sedilitif_gepumiduduvoju.pdf
    • https://jinuvavuvebox.weebly.com/uploads/1/3/4/6/134612635/zupiwonajopi-vetisosiw-fotozetom.pdf
    • http://badoxik.scienceontheweb.net/xisevedenipep.pdf
    • http://vengriya.space/xitupitopakebozapudehcce6.pdf
    • http://xviiivbgz.com/why_is_my_wifi_blinking_orangexajfv.pdf
    • https://cdn-cms.f-static.net/uploads/4402717/normal_60397f0858c06.pdf
    • https://cdn-cms.f-static.net/uploads/4416495/normal_600b04ea96d73.pdf
    • http://aycotoro5.xyz/dvoretskys_endgame_manual_drive13260.pdf
    • https://cdn-cms.f-static.net/uploads/4475382/normal_60475a1f5ffee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/75684137-40fe-4587-8a01-17c97b05bf3c/libro_de_probabilidad_y_estadistica_cobach_resuelto.pdf
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_c79fae02ee9744f6a23a14f8e35c72cf.pdf?index=true
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_7feb0dc07f574df7ae5a208de22bb060.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ff78b0f4-1bd3-4736-880e-70239c89ce1b/how_do_i_put_my_call_on_speakerphone.pdf
    • https://uploads.strikinglycdn.com/files/6697515c-92b6-4979-b657-0311b4b285d2/kenmore_elite_dryer_clean_out_lint.pdf
    • http://kopolug.myartsonline.com/wipijavokugar.pdf
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_5b518a8afa454abcb837607376eeea1d.pdf?index=true
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_342a95f1a21d44ac847ca7a06f8195a7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/81195f37-dcca-4d1c-b522-d46696017a05/where_to_read_korean_light_novels.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_off0000f2e0.bin
84688ae47b46cf3bd502a3a8a9c6413f38309208272b04952866f72c4d4ad4f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 5276 bytes
font_01_sfnt_off000104dc.bin
1095cc27a35dad8cdd6fde8ad010cfe27f155b00c10d6694478788ca4af67bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 11220 bytes
font_02_sfnt_off00012b88.bin
3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 16096 bytes

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