Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd890f7e8b911053…

MALICIOUS

PDF

89.3 KB Created: 2021-09-14 09:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc1acb051d6a0ae32f156b63cf1e3295 SHA-1: 65ba63fbf99216664d41c1c08bf2aeeaca967f66 SHA-256: fd890f7e8b911053f9f1b0b7dbb651eb08626a5fd2ab2fd12ffdc728bf3a99d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and is described as a link farm. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and URL distribution suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://mp-hd.de/data/aktualnosci_imgs/file/pewejanokajorufi.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbe53a7a2---26492051443.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/69040116640.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/joweb.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/vovifolimujala.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/70453832877.pdfIn PDF document text
    • https://mar3ol.com/Files/files/zadogupixivoketelifenav.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/wavelokibox.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/24538783400.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/jebineludifobovapuvafav.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/93528573061.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/kenudoturopekukipi.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/34855897978.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/tinivi.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/zoverokugapebupetolewozo.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/51167389754.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0b33a2b7---33219769399.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/49974261424.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///vigik.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/33834827970.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/menitopijemadu.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/vegeni.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/jisopiso.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109090320159757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=list+of+apk+appsPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 10016 bytes
SHA-256: 73ba11bb7148374607e05105c683db56146a291df6d5d32b57d21a4c85594057
font_01_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 18804 bytes
SHA-256: f9f2ef406493d955db7108dab690fa9303eb3df7b9a6dccc403cf1e4872cec64
font_02_sfnt_off00014007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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