Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e6ea5ba12ed34b…

MALICIOUS

PDF

70.2 KB Created: 2021-03-31 13:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b85a31c06e86eb86371f32a2f1c8eba6 SHA-1: dd560ca1f52d3fb130c3d363dfbe63937c137e24 SHA-256: d1e6ea5ba12ed34b3cbefc5b5435a1ff0587e65babcd4dc38629f6aac5c70f69
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to drive traffic to external sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. No scripts were extracted, but the presence of numerous external URLs points to a content-driven attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/award?keyword=axial+flow+compressor+solved+problems+pdf
    • https://cdn-cms.f-static.net/uploads/4393752/normal_603d191470301.pdf
    • https://nogabujo.weebly.com/uploads/1/3/2/6/132681452/9964729.pdf
    • https://dorulitonen.weebly.com/uploads/1/3/1/3/131380258/57e1105a71.pdf
    • https://fedoxamanisoru.weebly.com/uploads/1/3/4/6/134668372/6949842.pdf
    • https://vivexizakodol.weebly.com/uploads/1/3/1/4/131483194/dumate.pdf
    • http://lolegig.22web.org/char_broil_smoker_grill_cover.pdf
    • https://bufotikebejunut.weebly.com/uploads/1/3/1/3/131398235/rolosuxavod_zisetavimuzaru.pdf
    • https://pimiwunuxijekez.weebly.com/uploads/1/3/2/7/132741089/xikove-dezopefegowutor.pdf
    • https://joralonu.weebly.com/uploads/1/3/1/6/131607047/dac60dae89f9.pdf
    • https://cdn-cms.f-static.net/uploads/4379362/normal_6012878fc66f8.pdf
    • https://cdn-cms.f-static.net/uploads/4460946/normal_60498b8b32b0e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_4f247e98b55a4ce6a325a6a7f39a1b8b.pdf?index=true
    • http://riserapewu.epizy.com/guidelines_for_breast_cancer_screening_and_diagnosis.pdf
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_c4cad78f58e640af8f366dc7505cd0ba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fb445542-93bc-4d33-b6ba-90cf33d76c51/tin_tin_chinese_menu_market_bosworth.pdf
    • https://uploads.strikinglycdn.com/files/abfaa486-09f6-44bf-abd8-e8cc466f8824/42586364824.pdf
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_cb541def639c4dfc95da26990c0e0b0d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5c48cf08-f785-43de-bfd7-eea674120e45/9850210734.pdf
    • http://pinogizege.rf.gd/personal_kanban_board_excel_template.pdf
    • https://uploads.strikinglycdn.com/files/2b90ab6b-de43-464b-8bdd-b7719fe6ba51/76696158017.pdf
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_14cc6e527f5640f893f80b8845011cd7.pdf?index=true
    • http://nazifaba.rf.gd/board_of_directors_roles_and_responsibilities.pdf
    • http://sotemapepuko.epizy.com/new_bangla_movie_2019_full_hd.pdf
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_6e5a801caa164f3f998ae8472af3c3ea.pdf?index=true
    • 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_off0000d3f5.bin
24ab304917751a3b5b94abf3412f51f28c7a3fe3beff111c851e78d0f5ffef7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 5648 bytes
font_01_sfnt_off0000e72b.bin
b48b50e04f4e67110397023763d6d34f10f41da0ff42fd4f2964b40e86282f45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 10616 bytes

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