Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a748f840465205…

MALICIOUS

PDF

70.8 KB Created: 2021-03-02 16:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0001c6f6628694d2c5ed8b33ece04745 SHA-1: e57bd06aad57dde23c313e22ef06af6e6dcf0792 SHA-256: c4a748f8404652051d03fb29227c20bb72120e4cc1cc2c49c5dc5caf6b2b6207
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The PDF_SEO_LINK_FARM heuristic specifically points to a large number of external links within a small PDF, suggesting a coordinated effort to manipulate search results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pelibifir.ru/wix?keyword=jamey+aebersold+scale+syllabus+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5fff3ac36b049.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/jiijhqn/pobonolajaxagufozodika.pdfIn PDF document text
    • https://relakurofur.weebly.com/uploads/1/3/4/8/134872141/4497464.pdfIn PDF document text
    • https://butiriretife.weebly.com/uploads/1/3/2/6/132681404/6339423.pdfIn PDF document text
    • https://gazezujebek.weebly.com/uploads/1/3/4/8/134881616/5cafb03376.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/lobuwudeve-kemugodid-pumilevu.pdfIn PDF document text
    • https://cdn.sqhk.co/gubujurit/icnBKPp/fojasugexotokega.pdfIn PDF document text
    • https://zoxalutaj.weebly.com/uploads/1/3/1/4/131407742/88d1d5a8c237f.pdfIn PDF document text
    • https://xidekudogigut.weebly.com/uploads/1/3/4/6/134683706/zijupopatukomirijox.pdfIn PDF document text
    • http://kuroramogesok.iblogger.org/wapking_serial_song_free_2018.pdfIn PDF document text
    • http://kiruvoxexuk.iblogger.org/sahih_bukhari_tamil_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418985/normal_5fdbdb2d54940.pdfIn PDF document text
    • https://bunutawopuzo.weebly.com/uploads/1/3/4/8/134868528/paroz_lorezep_wejawariwos_motelukefiburi.pdfIn PDF document text
    • https://kupifima.weebly.com/uploads/1/3/0/7/130775493/fb05e50a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gebozobab.epizy.com/swarm_intelligence_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/lab_safety_review_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/catholic_answers_deuterocanonical_books.pdfIn PDF document text
    • http://xavuguwibimovin.epizy.com/81885445190.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_off0000d622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD622 5532 bytes
SHA-256: e2e21a44ea749da8f060e385c1cd16bccc141c05d9a22e5f17a500c9d190ea0a
font_01_sfnt_off0000e8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DF 10760 bytes
SHA-256: 9acf9d109a65b0d4489a28eaaac90be6dd8b0c3f1db29ac50b2b3ed8382503de

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