Malicious PDF — malware analysis report

Static analysis result for SHA-256 426250b02c5940b6…

MALICIOUS

PDF

72.4 KB Created: 2021-03-21 09:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f21ee38f42e404d254b0b992496b4579 SHA-1: f65a5fb50d7113cb9848f5cdf6ba8303d4fe7e39 SHA-256: 426250b02c5940b60be121e9b891225c2020874e50ad00c49296b050e6b40c07
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/wix?keyword=forest+worksheets+for+3rd+grade PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5fdca410b4a98.pdfIn PDF document text
    • https://sukivafuxek.weebly.com/uploads/1/3/0/8/130874221/9863d83df4c.pdfIn PDF document text
    • http://xelamoxadavas.mywebcommunity.org/voxiwavolebifi.pdfIn PDF document text
    • https://jekugisolidib.weebly.com/uploads/1/3/4/0/134097103/wepazuxur_ziboxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402964/normal_604af19400901.pdfIn PDF document text
    • https://bakogala.weebly.com/uploads/1/3/1/3/131384254/1182066.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/ad9b23803026a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_602fb630a0ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458852/normal_604e597bcb7f8.pdfIn PDF document text
    • https://jebezijako.weebly.com/uploads/1/3/5/9/135964749/1976242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_602d9a6877757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_60377e4941833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5fe94888dc7dd.pdfIn PDF document text
    • http://trokot-roznica.xyz/3d_font_for_photoshop_cs64u5te.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5fe534b7b03b2.pdfIn PDF document text
    • http://tosety.xyz/toro_lawn_master_2_reviewsgcrlw.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/rewrite_the_sentences_in_passive_voice.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/kozibowisenatu/convert_to_dwg_in_autocad_2016.pdfIn PDF document text
    • http://kagijido.myartsonline.com/french_verb_conjugation_table_prendre.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/70204183609.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/jirameverekusedusafezafo.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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 5412 bytes
SHA-256: 296fba7d15b23cf3262a63e5478c74fbd6047a610ea7a930e032208320fea913
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10348 bytes
SHA-256: 26cfd81ccd9ceb90bd681399896fd9629b7e7084deea2287677fae26810035c0

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