Malicious PDF — malware analysis report

Static analysis result for SHA-256 e171ec34690b6cd1…

MALICIOUS

PDF

69.8 KB Created: 2021-09-20 18:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08ac357d90143527adb9f28bbe88bd51 SHA-1: 818f3997e9b04d407d5b8d173dae51823b576210 SHA-256: e171ec34690b6cd13ae58cf05edac3fff2825c9198967b7264fb9608f3a92ee0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious or phishing sites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the ML_NYX_PDF_MALICIOUS classification. The ClamAV detection further confirms its malicious nature. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=quantum+mechanics+notes+for+bsc PDF link annotation
    • http://xszhuhai.com/uploadfiles/files/35973588422.pdfIn PDF document text
    • http://93564497.com/userfiles/73300120340.pdfIn PDF document text
    • http://preiss.at/upload_files/files/40452177616.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/suworipagogek.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/zalivovaris.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/lowoluxelagetubotelulu.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210916142213.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/31162937443.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/jeruvi.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/16251690393.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b62dca599e640f179a70a1e877456186/4163719041.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/nomulasokugapukoj.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/sosexivisapaverov.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/xurobomavokebuwotada.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/mukedonifavexezererakut.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210904_AFA93BAFB4D76A8C.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/52791525198.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/39270607696.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/21850696852.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16144b80fa4894---wufaxasatasivivipa.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/senojexenobujolaforegeda.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/fimexojek.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/44614613197.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://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_off0000b238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB238 10852 bytes
SHA-256: 5151305fcc72b522f7e07025b205041b3e4dc29ed3b024cce6dc865a431d0a83
font_01_sfnt_off0000cb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE344 15280 bytes
SHA-256: 7e89528bcb5f18affb4f8595fedd6ef48af72b92a911fd97a0096b7d205d902c

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