Malicious PDF — malware analysis report

Static analysis result for SHA-256 5411defb4be91c88…

MALICIOUS

PDF

79.3 KB Created: 2021-03-30 06:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 695f4eacf7beea3eec3b51e2ed653bae SHA-1: 7dd15bd3fb7c99a92aa196255b45abac35999228 SHA-256: 5411defb4be91c88e127f0e4419998475ae713d7934538cba8aaea3968a65a66
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents, indicating a link farm or SEO manipulation tactic. One prominent URL, 'https://zajinet.ru/wix?keyword=tubemate+pro+apk+free+download+for+android', suggests a lure for downloading software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/wix?keyword=tubemate+pro+apk+free+download+for+android
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/be5a19947cfc.pdf
    • https://static.s123-cdn-static.com/uploads/4402032/normal_5fdf095101745.pdf
    • https://cdn-cms.f-static.net/uploads/4470029/normal_6053044aa4afa.pdf
    • https://nurekagenarufab.weebly.com/uploads/1/3/1/6/131636906/bidibonuvakugakiku.pdf
    • http://kedugobepuged.mywebcommunity.org/how_to_turn_off_ice_maker_sub-zero_550.pdf
    • https://cdn-cms.f-static.net/uploads/4466165/normal_603d11cea71d7.pdf
    • http://rexonina.medianewsonline.com/98067562263.pdf
    • https://cdn-cms.f-static.net/uploads/4447906/normal_602bdf4a65a58.pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/7520492.pdf
    • https://dikivofugejal.weebly.com/uploads/1/3/1/4/131453076/niririxu-venamimer-zodomo.pdf
    • http://mavixepajifulem.scienceontheweb.net/mukhyamantri_awas_yojana_mp_form_download.pdf
    • https://static.s123-cdn-static.com/uploads/4383795/normal_600071bd7c7d1.pdf
    • https://static.s123-cdn-static.com/uploads/4489607/normal_6001740eb840e.pdf
    • https://cdn-cms.f-static.net/uploads/4483337/normal_602d82caaedce.pdf
    • https://cdn-cms.f-static.net/uploads/4460476/normal_5fd91ef8f1f05.pdf
    • http://zenajok.medianewsonline.com/polarity_index_of_organic_solvents.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_04b2c97c531e43b1a4ce6e46b486317e.pdf?index=true
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_2698e7cfa9d74e5c8280a1316b469499.pdf?index=true
    • https://uploads.strikinglycdn.com/files/804e2953-479f-413f-91bf-3339f5f3b495/kit_evic_vtc_dual__atomizador_ultimo_4ml_-_joyetech.pdf
    • https://uploads.strikinglycdn.com/files/d01e1a00-a723-41b2-8e55-f1aa64ed39d0/lumekekogewatibanigalem.pdf
    • https://uploads.strikinglycdn.com/files/c6d5b0c5-4804-468e-aa3e-a43ea6d60303/kozezazojeletoxekapudozu.pdf
    • https://uploads.strikinglycdn.com/files/d042b056-ef7f-4335-882d-631f0e839710/vabunuzasemesukimewar.pdf
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_d4cda1316a804667b1aff1b8e1702023.pdf?index=true
    • http://sadozejeko.myartsonline.com/types_of_data_analysis_in_research.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd6.bin
b2777e3f310de2dc2e598172f0a7820630b23ab55d0d4ffdf85e527f0f16dc51
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 3088 bytes
font_01_sfnt_off0000f6dc.bin
7fbbe09bd210ad1d213317881d4bb23104d8cda4e491fd5e4700bb5d46186816
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 5256 bytes
font_02_sfnt_off000108b1.bin
14a4a07d6c604e495b5b2ada346cf391c8b3c046d13dfb21fcf53a411a2e7927
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 11212 bytes