Malicious PDF — malware analysis report

Static analysis result for SHA-256 def6771ebe8925af…

MALICIOUS

PDF

75.4 KB Created: 2021-02-12 12:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 018cd0abe58498a7a944ed2e847a564e SHA-1: 4ed185d8faaaf0df9c5711af59781094c83a330d SHA-256: def6771ebe8925afc04eba996b471e338b69f562d809d37994b307b087014bf6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting it's used to redirect users to phishing or malware download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=adding+and+subtracting+like+terms+worksheet+pdf PDF link annotation
    • http://arenaprobet.com/ielts_writing_task_2_sample_answer_sheetz6rr7.pdfIn PDF document text
    • http://lavka-karamel.ru/dawevetenoi5128.pdfIn PDF document text
    • http://cybety.xyz/chemistry_matters_textbook_answerslabrf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5fcd3891c31c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fc9c759e09b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425737/normal_5fe6cf1409c47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_602525e800235.pdfIn PDF document text
    • http://zobebukore.22web.org/beginner_waltz_line_dance_step_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_60226868f039e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5fe86a2d59907.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/85356138662bhkgm.pdfIn PDF document text
    • http://goodnatural.space/maze_games_labyrinth_board_classic_maze_puzzle_boxyejm5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepujelibip.epizy.com/acoustic_guitar_gospel_instrumental_music_free.pdfIn PDF document text
    • http://pimuxexud.epizy.com/gchq_code_breaker_challenge_answer.pdfIn PDF document text
    • http://bewegemoketofa.rf.gd/swirly_font_bundle_free.pdfIn PDF document text
    • http://ratadipemor.epizy.com/baluzumasaseganajasuzafeg.pdfIn PDF document text
    • http://sasunuvelew.epizy.com/airline_uniform_suppliers_in_chennai.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_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 5856 bytes
SHA-256: 5046bbb397428f8d62b87e70b363204d80bc4e108ac794006e14af80ce2c1316
font_01_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 10544 bytes
SHA-256: 954ccd5c554f538fe46dcc894d0c69354c2da9d99be7c284044cba2c7db19354

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