Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb38fdf33d54ed2…

MALICIOUS

PDF

79.4 KB Created: 2021-04-12 15:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 510689c09fd997822e55100abdb46dba SHA-1: 83c934a7dab886e1cf6e5a320e4683fd0ccc0d1d SHA-256: efb38fdf33d54ed25828fa45ceb279871d9075b6a3f274112b9706dbfd4b53cd
166 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_PASSWORD_ARCHIVE_LURE heuristics suggests the document is part of a phishing or malware distribution scheme, using a password-protected archive to evade initial security checks. The embedded URL points to a suspicious domain, likely serving as a distribution point for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/strik?utm_term=que+es+el+liderazgo+en+las+organizaciones
    • http://price-list.moscow/amsco_ap_human_geography_answer_key_unit_3drzyn.pdf
    • http://sesesuruko.mypressonline.com/19144917037.pdf
    • http://vuruboxaviripan.22web.org/zavidusanulawebuvoso.pdf
    • http://tafugegajotu.mygamesonline.org/46992766012.pdf
    • http://1xbet-registrat.site/58593780505i0lkd.pdf
    • http://nukicew.xyz/sebutkan_4_penulis_mushaf_al_quran_al_karimey31t.pdf
    • http://lamakexo.scienceontheweb.net/doraxiwetefev.pdf
    • http://gogotmif.space/how_to_read_better_with_dyslexiabje0l.pdf
    • http://mefizilexofe.66ghz.com/akai_mpc_5000_manual.pdf
    • http://table-wait.com/ti_84_plus_ce_pokemon_red_rom4ta98.pdf
    • http://vashobereg.com/nadoge0lizq.pdf
    • http://visobewitumimek.22web.org/liveforolu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8ec4b4d1-602f-4090-a8e3-87c403a1d2f1/35375452102.pdf
    • https://s3.amazonaws.com/donarepemi/round_sticker_mockup_psd_free.pdf
    • https://uploads.strikinglycdn.com/files/1bec3183-b8bb-485d-8baa-180d7b58be8d/what_is_rectangular_coordinate_system_in_physics.pdf
    • http://xuneviwek.epizy.com/carillas_de_porcelana.pdf
    • https://uploads.strikinglycdn.com/files/cdca8b3c-f592-4484-867d-5939ad68de17/18564233401.pdf
    • http://penanaras.myartsonline.com/honeywell_rpls730b_user_guide.pdf
    • https://uploads.strikinglycdn.com/files/81d47f9a-787f-466e-b59c-5b5b72d7a86d/wujikujezesudipirola.pdf
    • https://s3.amazonaws.com/tedowafomaru/alimentacion_balanceada.pdf
    • https://s3.amazonaws.com/viwoxuz/86424569185.pdf
    • https://s3.amazonaws.com/daxemo/enders_game_movie_download_in_tamil_dubbed.pdf
    • https://s3.amazonaws.com/rebesudanolo/how_do_i_fix_my_hp_printer_that_is_offline.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_off0000f743.bin
cedaa5657097b097b7a7485ceaa5eed4f474d7fef8ea5f033ae86554d8485ce8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF743 5220 bytes
font_01_sfnt_off00010919.bin
0d52820d7a5acf44b9bb74d400503e754c4f0c470a670b6aca1b202e58960a0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 11380 bytes

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