Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ce553ddb33e067…

MALICIOUS

PDF

76.9 KB Created: 2021-03-14 02:11:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1b51a8150983e84cf841f8acf95ab08 SHA-1: eea7655dc316e60d7ef66278b183cfd66a17ff61 SHA-256: 86ce553ddb33e0673db3669c28e01d2e419ed84cc0d12954119986bb89edd715
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. An embedded URI points to a URL that mimics a search result, likely intended to trick the user into clicking it. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://leonvi.ru/wix?keyword=austin+isd+blended+model
    • http://mif-smeh.space/dutebivigum6sa8c.pdf
    • http://extrameets.fun/final_fight_epic_fighting_games_unblockedilyg5.pdf
    • http://complerbnp.com/15652701515j3s33.pdf
    • https://lekudelido.weebly.com/uploads/1/3/1/3/131378953/dulud_tokow_takuxozutiwipu.pdf
    • http://suporefebakibur.mygamesonline.org/how_much_do_entry_level_data_scientists_make.pdf
    • http://freshmind.net/how_to_mix_colours_to_make_redu82dp.pdf
    • http://vanlit.ru/livestock_research_for_rural_development_author_guidelinesbuz8f.pdf
    • http://topvideo.design/jatadimijakefukids4c6p.pdf
    • http://zozavelomidabi.scienceontheweb.net/fundamentals_of_arm_wrestling.pdf
    • https://cdn-cms.f-static.net/uploads/4404490/normal_602b4f48344a8.pdf
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/3874765.pdf
    • https://fobulosarurek.weebly.com/uploads/1/3/3/9/133997379/kamad.pdf
    • http://reactivascotia2020.com/mechanical_engineering_georgia_tech_graduateqjmor.pdf
    • https://cdn-cms.f-static.net/uploads/4387035/normal_600eb150eed49.pdf
    • http://nefozufovi.scienceontheweb.net/how_to_calculate_percentage_strength_of_h2o2.pdf
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/3717310.pdf
    • https://cdn-cms.f-static.net/uploads/4465249/normal_60469a017f69d.pdf
    • https://terulupi.weebly.com/uploads/1/3/1/4/131406892/mamuxegavexukaxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bokepomi.onlinewebshop.net/pupafuzeditamafez.pdf
    • http://lexamokoxerum.atwebpages.com/bawazerozukowagax.pdf
    • https://uploads.strikinglycdn.com/files/91015231-8a66-4c1c-b7a7-a9e402d9e0c9/rotisijakifaru.pdf
    • https://uploads.strikinglycdn.com/files/099eae8e-a718-4908-aa90-120b0aadd902/how_hard_is_the_phr_exam_2019.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_off0000e6d1.bin
b11bcdde76698826e379246420bc038972407df13a39cf0a11a79395b95efdff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 4792 bytes
font_01_sfnt_off0000f703.bin
3e380fe852df28098b2b6cb7ab5b8a85d53842ac78fa1d954393937b1e818cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 2408 bytes
font_02_sfnt_off00010180.bin
721eac5400ccad5eafa358dd8490bf1d4a2fcc8cf492d5e8a80d92ac2a38bf21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 10844 bytes

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