Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e55f1be305030c9…

MALICIOUS

PDF

68.7 KB Created: 2021-02-24 15:50:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d6480645622ac66641597a63e879ada1 SHA-1: e8451528b337e0427c8b8cbbc7bcc162766671d6 SHA-256: 8e55f1be305030c9db0fd25005a4ee3134461aefb3aba208e90fd836c536a866
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identify it as a link farm hosted on disposable domains, with numerous embedded URLs pointing to potentially harmful content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of multiple external URIs and the link farm characteristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=94+sham+bl2 PDF link annotation
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/tabekabet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5ffa726c9abfa.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/tosazomadako.pdfIn PDF document text
    • https://fosijegaden.weebly.com/uploads/1/3/4/8/134868146/lumiwuki.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/hhijjjb/11150293472.pdfIn PDF document text
    • https://bifimazetaxa.weebly.com/uploads/1/3/5/3/135326975/lemiwe_rebelup_pumupawotid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5fe6a6701aa3b.pdfIn PDF document text
    • https://cdn.sqhk.co/jalizovi/hjfwpij/hello_ludo_live_online_chat.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/lKigNjC/2266818649.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480142/normal_600078351fd00.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/icbhfyF/katawuzugeramerulo.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/hOkggic/98686364343.pdfIn PDF document text
    • http://namelesssouth.xyz/57300415085pez4m.pdfIn PDF document text
    • https://namutaborizelo.weebly.com/uploads/1/3/4/7/134766338/6928584.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/dokol.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/51000012890.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_off0000d0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F5 5252 bytes
SHA-256: c0ff039ac326d63304c10059ab95cb7ddf53dcc13c34618ccfbee7e5a871d2c5
font_01_sfnt_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 10472 bytes
SHA-256: df67fb8da6633ed7dd23159c54b99258f967423eac1e3bdd4b5286aa171929c7

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