Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e5bdf2511bc901…

MALICIOUS

PDF

79.3 KB Created: 2021-03-24 08:20:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 016f529b9c37c1be5802405d61f8410a SHA-1: d5f9ee04a3b506262d20be869d54f2ec690dc994 SHA-256: e2e5bdf2511bc901e751c2982f56b3fa6cf5f046aa0581889a74e9eec6d91704
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary purpose appears to be directing users to a wide array of external resources, potentially for SEO manipulation or to serve as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://kuzutuzo.ru/award?keyword=bulats+test+1+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424666/normal_600ca5fa1eb26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_605a29ae5adcf.pdfIn PDF document text
    • https://wasizizinawuj.weebly.com/uploads/1/3/6/0/136096362/1725828.pdfIn PDF document text
    • https://nugivukowunel.weebly.com/uploads/1/3/4/0/134041243/9444936.pdfIn PDF document text
    • http://lavka-karamel.ru/tiranadifedukisingvx.pdfIn PDF document text
    • http://ufenmac.com/62045381894lwdem.pdfIn PDF document text
    • https://tupedofezelazib.weebly.com/uploads/1/3/4/3/134368784/zugitevofusorup.pdfIn PDF document text
    • http://dofukatejipoz.66ghz.com/jimubizuxumufozawikonodiw.pdfIn PDF document text
    • https://gosupafitowiru.weebly.com/uploads/1/3/4/6/134673249/ea02493ae35487.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/2018_tamil_horror_movies_freekzwkr.pdfIn PDF document text
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/xazet.pdfIn PDF document text
    • https://redutoxaxijarow.weebly.com/uploads/1/3/4/7/134760413/ludadi.pdfIn PDF document text
    • http://qqkaxes.xyz/stress_management_techniques_wikipediagzf2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459318/normal_6035d26d20919.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8325fa2c-5f3b-4f96-9dcd-ef242e3ea2c6/69660372323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd54779-ada0-4964-a0e4-00b5de4a5641/do_wireless_electric_dog_fences_work.pdfIn PDF document text
    • http://fewabasutagit.rf.gd/positive_psychology_theory_model.pdfIn PDF document text
    • http://bikaxubu.rf.gd/rowdy_baby_hd_video_free.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_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 5040 bytes
SHA-256: 6ee3e84c23612d6187af7c5775013b44ad40c1f43812acfc2f6fb70a46c6c17a
font_01_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 11156 bytes
SHA-256: 4a52fde8e5146a10db36009d9ff9cb2496aa969a1680ff7bfca3c3ea31c66f9a

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