Malicious PDF — malware analysis report

Static analysis result for SHA-256 f535bf2530e77ff4…

MALICIOUS

PDF

78.7 KB Created: 2021-03-28 05:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1ac3e4b8eba1f07cd12c6ebe64a6cca7 SHA-1: 50e9ce95c0133e1ce63f581b2b8df2da4fceff79 SHA-256: f535bf2530e77ff45b9c663a4f5b53b893147d4b6c9738e81c218e7c34b7047d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting or unknown reputation sites, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm designed to redirect users to 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://zajinet.ru/wix?keyword=contabilidad+como+ciencia+segun+autores PDF link annotation
    • http://vujejike.iblogger.org/55330640309.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/gggVXhe/41004404312.pdfIn PDF document text
    • http://wifokilite.iblogger.org/nags_head_pier_fishing_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_601f290fae9b6.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/7kii8hd/80272759994.pdfIn PDF document text
    • http://kpupnov.pro/855502128136ier4.pdfIn PDF document text
    • http://yewes.space/zafajajafijq5ox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417664/normal_60595ffb7677c.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/jbietja/advance_auto_parts_jacksonville_fl_32225.pdfIn PDF document text
    • http://italy-small.space/13057749221o50hs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutilokip.epizy.com/decimal_worksheets_year_4.pdfIn PDF document text
    • http://semodozafilisu.rf.gd/biochemistry_questions_and_answers_for_medical_students.pdfIn PDF document text
    • http://pavebutom.epizy.com/31776264694.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/the_hobbit_book_original_cover.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/durarimajigiludasax.pdfIn PDF document text
    • http://zinabukupomij.rf.gd/tumuxutasewuda.pdfIn PDF document text
    • http://ruzowedomox.epizy.com/search_google_history_on_phone.pdfIn PDF document text
    • http://vewoledigi.epizy.com/ben_10_movie_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/alphazero_stockfish_pgn.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_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 5304 bytes
SHA-256: 91d9b648fb63d442318d25b27ab0636ee529515221faab70e702e1785b875baf
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 11332 bytes
SHA-256: c3da9f0309b7720d23445a5afb806b5f6454cb511a943d6eb94b04bccaddd545

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