Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fa56c86646d6a6…

MALICIOUS

PDF

79.5 KB Created: 2021-03-30 05:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8ad60bfbf29b54917dff8e10d9f76688 SHA-1: 0964291e8784559ce4e09df1ca3f69f4e7b96fa2 SHA-256: f5fa56c86646d6a67d1e040cf2bf2deaab9776a7405a7ee385f7dbce2378fbd8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'kuzutuzo.ru/award', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/award?keyword=silent+words+in+english+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404296/normal_6018ed62b147e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_600170f5e4296.pdfIn PDF document text
    • http://creamwalls.online/decimals_in_words_worksheet_grade_4156g1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_5fd94bbb0cedb.pdfIn PDF document text
    • http://copyright-notice-ig.com/629650552982vuiz.pdfIn PDF document text
    • http://getdouche.xyz/how_to_draw_anime_girl_hair_accessorieswppit.pdfIn PDF document text
    • http://sandwichhq.club/namuranoxaprc7m.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/kilumelezeluzipogipelul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482619/normal_606285779a88c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_6051ffc4ba366.pdfIn PDF document text
    • http://baluninelekab.22web.org/simile_and_metaphor_worksheet_4th_grade.pdfIn PDF document text
    • http://qwertyujg.xyz/5030818717jocdn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/junazuvezelubelobav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdfd06c-f12e-4193-b7bc-63b9ee8a321e/hearts_of_iron_3_free_download_mac.pdfIn PDF document text
    • http://tujolelulovowew.rf.gd/vazobataretid.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/antivirus_para_tablet_android_gratis_avast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a569835b-b19b-4110-85f6-73f37ef96b7d/43022011849.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/edmodo_quiz_answers.pdfIn PDF document text
    • http://fevejalamozek.epizy.com/brainspotting_book.pdfIn PDF document text
    • http://sawurawefivovo.myartsonline.com/soxepamug.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 5288 bytes
SHA-256: 66b1813daf5eef60e93414d00162774c6fc7ef6859efd979bf17f1cce1c9c753
font_01_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 12972 bytes
SHA-256: 0cbdbe8b5c287538fcaca0bf3838618412673fb2f7a9589d961bae24026324cd

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