Malicious PDF — malware analysis report

Static analysis result for SHA-256 c980659519f3a65f…

MALICIOUS

PDF

89.4 KB Created: 2021-04-07 01:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e936e9ac020c18f970c2bfa4fabef485 SHA-1: 77c9c1f0daeeeb05947a267609fee46d851d7b02 SHA-256: c980659519f3a65fe7d5adccad7c0f6af3bcae69b3025aefefc9f09480da38a5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to other PDFs. One of the primary external links, https://jumiwimov.ru/strik, is suspicious and likely leads to a malicious site. The document body, though heavily obfuscated, contains text fragments suggesting a lure related to a 'midwife's tale'. The presence of embedded PDF link farms and suspicious external URLs strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=a+midwife%2527s+tale+introduction+summary
    • http://pugorot.mygamesonline.org/what_does_error_e_mean_on_my_honda_radio.pdf
    • http://pozijuza.scienceontheweb.net/89294321871.pdf
    • http://warokibujiz.getenjoyment.net/bagasse_definition.pdf
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/nuzimabelul.pdf
    • https://toguvanamevodo.weebly.com/uploads/1/3/4/6/134615804/3781968.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vibuvomomuv/67248136317.pdf
    • https://s3.amazonaws.com/sizabo/33305936006.pdf
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_e2c5beb6bef040b4ba9065fe5db2b6ac.pdf?index=true
    • https://s3.amazonaws.com/xonaxevetaf/how_to_decorate_a_white_christmas_tree_with_multicolored_lights.pdf
    • https://s3.amazonaws.com/rozebofukixus/upsc_assistant_commandant_syllabus_2017.pdf
    • https://s3.amazonaws.com/salosibejodod/29573703229.pdf
    • http://gevejonitu.onlinewebshop.net/metropcs_insurance_deductible.pdf
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_84263f29375f455fa03902408970736a.pdf?index=true
    • https://s3.amazonaws.com/nisoxow/jubatarunawasamewijumawif.pdf
    • https://s3.amazonaws.com/xozeb/25293083763.pdf
    • https://17500468-634e-4f48-81ad-48a4a068d6fa.filesusr.com/ugd/dcac76_40ad6f0604ec422482d02130f9a748e1.pdf?index=true
    • https://7c50ec62-1ece-451b-b03c-4788199016cf.filesusr.com/ugd/635f3c_dab6f95313f64790b0063b3722162ce1.pdf?index=true
    • https://s3.amazonaws.com/jefobexapulow/21647534631.pdf
    • https://s3.amazonaws.com/dinisemowoge/auto_reduction_tacheometer.pdf
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_aba0041d2e964e78bc0a94c99aec59c5.pdf?index=true
    • https://s3.amazonaws.com/zoromexemuzid/big-_o_algorithm_complexity_cheat_sheet.pdf
    • https://s3.amazonaws.com/juliziwojatige/is_depression_cognitive.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/dyson_canister_vacuum_manual.pdf
    • https://s3.amazonaws.com/bisiku/apex_legends_ps4_cross_platform.pdf
    • http://tevefetilojas.atwebpages.com/kipakumomamebinepa.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_off00011fa2.bin
3098f739d6f038bf07f62c476ce7ca95c277ac79f58cf951d79577417b9a1eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 5384 bytes
font_01_sfnt_off000131fa.bin
46a078533f5ad90e065071e42aecc8eef1e177b01c408f60b8cc332096cca775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131FA 11764 bytes

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