Malicious PDF — malware analysis report

Static analysis result for SHA-256 47955f8f31fd17d2…

MALICIOUS

PDF

78.3 KB Created: 2021-05-11 22:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a416bb76819d45838d349f7e98bcc484 SHA-1: 9d501356130e05beb4a587f8a10143233cdfd232 SHA-256: 47955f8f31fd17d2203b10651184680df0b88f7bb379eb1cf4c3523cc5547583
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Troy bilt tb2246 blades' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of many disposable hosting links further supports this. No scripts were extracted, but the PDF structure itself is leveraged for malicious purposes.

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://dugedepap.ru/strik?utm_term=troy+bilt+tb2246+blades PDF link annotation
    • http://reassurez-moi-fr.info/wefbee_auto_likerb9idv.pdfIn PDF document text
    • http://dudisigufazalu.22web.org/53735781255.pdfIn PDF document text
    • http://totalcreditreport.info/62152003436u193u.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/giXh24B/gluten_free_pancake_recipe_king_arthur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453551/normal_5fee4ae8588ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_602a2f4f01e38.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/Ohejdjh/98387017476.pdfIn PDF document text
    • http://avtoshtorki.shop/4358768109mn3du.pdfIn PDF document text
    • https://cdn.sqhk.co/jameleber/gfiaw5O/38951059119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_602fe241cfa7c.pdfIn PDF document text
    • https://cdn.sqhk.co/xukerejolar/hc36LaK/67349884447.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/maravilloso_desastre_libro_1dvwlo.pdfIn PDF document text
    • http://dutov.org/begosevokeborevojozimoqtifz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwimev.rf.gd/snowbear_trailer_company.pdfIn PDF document text
    • http://mapureju.epizy.com/casio_g_shock_ga-100cf.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/peacock_cichlid_care_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/zibiwimiwurumaz.pdfIn PDF document text
    • http://jijabivu.epizy.com/after_movie_trailer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/bstc_result_2018.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_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 5384 bytes
SHA-256: ddc16fdd147e825dc7f5e74164b8c4c98392de1d35d6960bff59999ec4025eb5
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 11032 bytes
SHA-256: c2a62ec3638256c07978cd5f8b6da59231743696961c4643fc4a1ad6f0491f5d

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