Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bb52eb1fa75359…

MALICIOUS

PDF

82.4 KB Created: 2021-03-22 22:01:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 08e7901efd97608faca4d0eb992d3fab SHA-1: 404b9527f3d2dd8ce2e40ebb22efbeeef8c532de SHA-256: a5bb52eb1fa75359bf10a7151c79af3e53eb79f388eec025f785343ef1bfbef9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('ponafet.ru') and a query parameter suggesting a lure for 'brawl stars game for pc'. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious, supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=brawl+stars+game++for+pc PDF link annotation
    • http://rotixumuzu.22web.org/why_does_my_sanyo_tv_keep_flashing.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/hW6Urcv/stunt_truck_jumping_mod_apk_free_download.pdfIn PDF document text
    • http://fisuruwibowin.66ghz.com/22580196125.pdfIn PDF document text
    • https://cdn.sqhk.co/sasimidiweg/3jiChjh/build_and_shoot.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/shdhgAG/black_friday_apple_watch_3_deals_2019_uk.pdfIn PDF document text
    • http://fetazobamu.iblogger.org/puvoruvaxapadazolofusop.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/igQ0uWh/temple_run_2_apk_free_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/tobizopowebo/yjh9hdE/super_mario_bros_pixel_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://waboxizolomove.rf.gd/funcion_del_sistema_endocrino_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/de_jogos_para_pc_pelo_utorrent.pdfIn PDF document text
    • http://serinuzosazojup.epizy.com/19696417977.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_6e1c317bcb6a4a488c8251afa3b51183.pdf?index=trueIn PDF document text
    • http://laguwirir.epizy.com/photosmart_5520_ink_cartridges_staples.pdfIn PDF document text
    • http://pedefulavok.rf.gd/adobe_audition_3._0_free_32_bit.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_5244d5b7a7ba4a3790b4a3685a5d8bef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/geresoxetikonagajoro.pdfIn PDF document text
    • http://wadafitukaleka.rf.gd/seronube.pdfIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_f6445cf94ecf42f6b79c11db7f9ebc0e.pdf?index=trueIn PDF document text
    • https://4192d618-ecd7-4808-8485-efd4d6773ded.filesusr.com/ugd/17a5db_3f6327d2d7f441fea185032a9b4c0f39.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_22991f8aa6be421c8e56c8b9c3badc32.pdf?index=trueIn PDF document text
    • http://tadudaxejede.epizy.com/how_to_start_a_screenwriting_business.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/77704924772.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/28015179865.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/what_is_the_size_of_carry_on_luggage_for_american_airlines.pdfIn PDF document text
    • http://zeruviwo.epizy.com/kusaparalezoxujaxovufikuj.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_402faccb0b3143309384387a5f55e380.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 5476 bytes
SHA-256: a02c7f5ac2cb9ee9c5935d8dc7b42886e84577957d7c3442dd1b417953322174
font_01_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 11016 bytes
SHA-256: 5b1ead2c3b9d164c41a53f0e1d5a5419a2e1a83f5d9d4a1e6877cf79c13341d2

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