Malicious PDF — malware analysis report

Static analysis result for SHA-256 1925c9c4c93344de…

MALICIOUS

PDF

65.3 KB Created: 2021-03-17 16:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b7fbfe743a00201d8a063f8abe652027 SHA-1: 9beaedb5c5a5edcd7bc4678644a509313d6678c9 SHA-256: 1925c9c4c93344de9ae4e22441761ce0a586589fca0433bbefb714a9456a20b7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=delonghi+pinguino+pac+cn120e+maintenance PDF link annotation
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/nipipemubefabej-mowosisiboxazo.pdfIn PDF document text
    • http://tujugebisuxilun.22web.org/tosanob.pdfIn PDF document text
    • http://jasubizajimalep.iblogger.org/list_of_trigonometric_identities_and_formulas.pdfIn PDF document text
    • https://cdn.sqhk.co/bizewavaxug/eM3Lgh1/kgb_archiver_2_free.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/jozut.pdfIn PDF document text
    • http://pufonorigaji.22web.org/arctocephalus_australis.pdfIn PDF document text
    • http://gobuweba.22web.org/abbreviation_dictionary_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/NdN1igX/nakuwisovewezuwonewos.pdfIn PDF document text
    • https://buresususotolo.weebly.com/uploads/1/3/2/7/132710635/4236e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_ccd4250d959f4ba3ac46cc5539452862.pdf?index=trueIn PDF document text
    • http://genenapukiral.epizy.com/67520046146.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_f12cea59815143ee904bafd7697b8df4.pdf?index=trueIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_e86a39dd72774d3280415784f68fd3fd.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_7a3d211aa9574c94935f9cd6f911ccc0.pdf?index=trueIn PDF document text
    • http://jatujij.rf.gd/12780901372.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_7377249da40e400a84a322f4ac6f4ca7.pdf?index=trueIn 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_off0000c2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 5400 bytes
SHA-256: 78effb23dbf68753164222e69bf298caa04b9cccb3c9ac44933b22f182f826bf
font_01_sfnt_off0000d4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E6 10396 bytes
SHA-256: 4cda5fffee5462f26f94090ba77af9ef0a1e518d557b1713e7fea4605fd1d781

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