Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0b70242169b8da…

MALICIOUS

PDF

76.1 KB Created: 2021-03-23 02:56:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8e0b4ef51e521368fa7c4ec62f405348 SHA-1: 5dd1f2e9310202e54df21a941914ffde14fe9d9c SHA-256: 2f0b70242169b8da06ba9f89263ac25a0b5b7e132f57cbe8ce014eed1060724f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains including 'kuzutuzo.ru' and 'static.s123-cdn-static.com'. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and appears to contain junk data, but the presence of external links suggests an attempt to redirect the user to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://kuzutuzo.ru/wix?keyword=chihiro+fushimi+voice+actor+english PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415531/normal_5fc9ee43aec6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413000/normal_6003a513bdaef.pdfIn PDF document text
    • http://reweder.site/the_art_of_happiness_chapter_2_summarydyt1g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420224/normal_605939a0e6268.pdfIn PDF document text
    • http://servisvds.ru/starbucks_plastic_sippy_cupsuuz2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_601be01cb195a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5fd6411f5b648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_60533dd8e89ae.pdfIn PDF document text
    • http://nakanilo.club/wd_my_passport_wireless_pro_ssd_upgradeycgt9.pdfIn PDF document text
    • http://perevod-card2card24.site/where_can_i_watch_the_darkest_minds_2hxnon.pdfIn PDF document text
    • http://community-day.ru/wolaresapebunotijekajonm8u1v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45f0f727-c607-4398-b3b7-8b42e23b21b2.filesusr.com/ugd/0a84ca_08e22d9486e440dc82a1b6d60f29d0e5.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_6637ebbcc9064ecd963f98629c52fde1.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_d8f05a9a3e8248d48aa6b3c3fe8c6fcf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/mozart_concerto_no_5_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/twilight_graphic_novel_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/bandhan_bhojpuri_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/history_of_islamic_civilization.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/91201455816.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/sosigif.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/how_to_adjust_lorex_camera.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 4360 bytes
SHA-256: 27879844171c5bf4686c2845ce965b9c931753c4106ed54b2e814e9971946b51
font_01_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 5260 bytes
SHA-256: f37d33e62e8dfc731a99ca79194a080e074db46e03cda88a4ddc482740936e20
font_02_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 10208 bytes
SHA-256: 6aa8a85f26a186efcbac3460263c46124b3977e47316044978d50d1a28e451ca

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