Malicious PDF — malware analysis report

Static analysis result for SHA-256 8954ca38073da0b1…

MALICIOUS

PDF

71.0 KB Created: 2021-02-23 23:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 005b529323ebc3829f92184b886890b9 SHA-1: 796f39a060a9282c07087fdca38b5007b1db4ef3 SHA-256: 8954ca38073da0b162df109645243a33035c86b712a68effd9f5b9df8f004189
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, which is characteristic of a link farm used to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'dutch bunnies' and includes metadata from wkhtmltopdf, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=how+much+do+dutch+bunnies+cost PDF link annotation
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/fezobawabukawelafut.pdfIn PDF document text
    • http://geleostone.online/678412360367q22n.pdfIn PDF document text
    • http://cozyplacefor.rest/pioneer_deh150mp_manual4xcnl.pdfIn PDF document text
    • http://toteganutiv.66ghz.com/garodi.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/ctFejby/mazm_jekyll_and_hyde_fan_art.pdfIn PDF document text
    • https://lixojubenolida.weebly.com/uploads/1/3/4/3/134375882/1007002.pdfIn PDF document text
    • https://cdn.sqhk.co/ragonujip/iageTjd/save_the_girl_game_download_for_windows_7.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/f0c1122.pdfIn PDF document text
    • http://sizoxuk.22web.org/suwetanuzavuv.pdfIn PDF document text
    • https://wigimosasalak.weebly.com/uploads/1/3/2/8/132814057/978a585e82fe.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/2688019.pdfIn PDF document text
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/vukali.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/ijs2hbY/56028822373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koraxirimaxodet.epizy.com/migazok.pdfIn PDF document text
    • http://nawonarubital.epizy.com/jisonigidinoxizomonezi.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_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 5032 bytes
SHA-256: 6b0f0b5a0682000b5ddb9c3c1f02e61dc794a1d4535a40bc33f1fc9d4f0a8391
font_01_sfnt_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 11112 bytes
SHA-256: 3fd56d8ab1744df3f9b412d5b27037a82dc04ef70b0496ee82bee48e9c7bca11

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