Malicious PDF — malware analysis report

Static analysis result for SHA-256 386a8f5aac61a584…

MALICIOUS

PDF

79.2 KB Created: 2021-03-08 19:17:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28210cbbf4e2f135aaeb11bbc725ae57 SHA-1: ebef03692018abee469afc6f01a00cd62bac86c3 SHA-256: 386a8f5aac61a58430a6acb69ef85f403efaa19af0c099b9b0c86286c3b8a8b0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The PDF contains a large number of external links, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://dafemum.ru/aws?utm_term=baofeng+uv-5r+charger+flashing, is flagged as unknown reputation and is likely part of the malicious infrastructure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/aws?utm_term=baofeng+uv-5r+charger+flashing
    • https://cdn-cms.f-static.net/uploads/4422912/normal_602da974ed7b6.pdf
    • https://cdn-cms.f-static.net/uploads/4421350/normal_6036a330e3dbb.pdf
    • https://nawopudupavipe.weebly.com/uploads/1/3/4/8/134856820/jefexeza.pdf
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/661699.pdf
    • https://cdn-cms.f-static.net/uploads/4412588/normal_602dc653c25ee.pdf
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/0194078a5468.pdf
    • https://mesasijodise.weebly.com/uploads/1/3/5/3/135315214/5541798.pdf
    • https://zeduxuvanoripi.weebly.com/uploads/1/3/0/7/130775880/e2a04c3e.pdf
    • http://ruvujagefeko.mygamesonline.org/nimuzusiretawolotizozag.pdf
    • http://purubifo.medianewsonline.com/vapuni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_bda55b3b88b1482caacf05d073e4ef82.pdf?index=true
    • https://s3.amazonaws.com/ritoma/tipping_point_definition_francais.pdf
    • http://jikibepedoroto.epizy.com/crystal_reports_version_10_free.pdf
    • https://s3.amazonaws.com/xupovobejanam/cercle_de_la_forme_porte_de_versailles.pdf
    • http://vewamade.rf.gd/dijediximavuk.pdf
    • http://karatufi.epizy.com/getivugiwerebumosap.pdf
    • https://s3.amazonaws.com/tumasun/bricks_intensive_reading_2_answer_key.pdf
    • http://robavumu.rf.gd/how_to_reset_ink_pad_l120.pdf
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_26c2841b107a456b9857939d7e00bee3.pdf?index=true
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_d54643282ffc46eeb6449812b18f5e14.pdf?index=true
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_84a5aa2f6df2452c84134c43b3cdaf5f.pdf?index=true
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_0e79978a3d08483886847c03a9aae9ab.pdf?index=true
    • http://rexigume.epizy.com/jvc_kd-r200_wiring_diagram.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_off0000f6fe.bin
9aef08000d472b3294b22f7b6d65b5f4c703f80ea25165a6e7a091631bd10a7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 5408 bytes
font_01_sfnt_off00010977.bin
fcbb0cedcb2f19a0a3d1f3cb518b60941dbae3776aff3e64fadc286ed21fd424		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10977 10592 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.