Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cbdf8f2bbaaffb…

MALICIOUS

PDF

75.8 KB Created: 2021-03-20 20:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4727db1fb9f2797bd8e4d56c0eb04fa3 SHA-1: 72a5e7a596c261c14173d556ad72dfb5bc996183 SHA-256: e1cbdf8f2bbaaffbfb7cb33549219b6eb2b83758f8c05d844eaa716308dedf1a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, which is indicative of a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=softball+diamond+dimensions
    • http://suzuxef.22web.org/27510241757.pdf
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/80716.pdf
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/sotebe_mibekuwitizala_wajilelaxiki.pdf
    • https://sudirunerobup.weebly.com/uploads/1/3/4/8/134877260/c418dddc.pdf
    • https://lexabefi.weebly.com/uploads/1/3/1/3/131384613/bb68be799cfdcb.pdf
    • http://winatesef.sportsontheweb.net/ielts_academic_writing_task_1_sample.pdf
    • https://febasenijig.weebly.com/uploads/1/3/1/3/131379808/rikel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xabalaru/mtb_chain_guide_bb_mount.pdf
    • http://birukuf.onlinewebshop.net/explain_budgetary_control.pdf
    • https://s3.amazonaws.com/muvevanepen/rilegakonevukagizefojemo.pdf
    • http://vedixemalirugi.atwebpages.com/55658583039.pdf
    • https://s3.amazonaws.com/jopomodilamego/31079460145.pdf
    • http://vilumepidiwego.myartsonline.com/how_to_cook_rice_in_black_and_decker_rice_cooker_plus.pdf
    • http://bilunijo.epizy.com/benzinpreise_aktuell_app_android.pdf
    • https://s3.amazonaws.com/tipikaxe/jonepewidutiwibewiti.pdf
    • https://s3.amazonaws.com/xamapebonijos/cdsco_guidelines_for_bioequivalence_studies.pdf
    • http://gazisemodab.epizy.com/how_do_i_check_my_system_specs_windows_10.pdf
    • http://notewewagegev.rf.gd/ronij.pdf
    • https://s3.amazonaws.com/rojalexipokadaz/filing_a_police_report_san_francisco.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/79929366210.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe7.bin
a745591ca357ccd6b9dea9d8e1215c31d8bd03e9d509fbbed7d59028a71f7fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 5200 bytes
font_01_sfnt_off0000fd82.bin
f55df7922e0ad39fe6e7e613637c290b29b144ba6c288707df60a7d1979597f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 10500 bytes

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