Malicious PDF — malware analysis report

Static analysis result for SHA-256 a538520da1373e92…

MALICIOUS

PDF

73.9 KB Created: 2021-03-14 05:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 221063258848a49ecfb2b0faf368f546 SHA-1: 468768c89fd30189e6bc5d7abd32e36bd1f35d02 SHA-256: a538520da1373e928044e4d7e8510cb4bba71770500109e10733de4917267b70
124 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by an ML classifier and contains multiple embedded links. One link, https://yafferge.ru/123?utm_term=allu+arjun+videos++sharechat, is identified as a known malicious redirector. The PDF also functions as a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of malicious links points to a likely phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=allu+arjun+videos++sharechat In PDF document text
    • http://esclick.pro/366361127479vmkh.pdfIn PDF document text
    • http://livecopyrightverification.com/beats_solo_pro_review_vergerxbx4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_600d4cffae881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_5fda020a98679.pdfIn PDF document text
    • http://sputnews.com/which_companies_hire_mechanical_engineershj6q9.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/dieta_alcalina_cancer.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/52050361984.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/administracion_financiera_contemporanea_moyer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_9b46378f948442c9a533dc8302602e34.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_45b0f6f695b849fc9c54b427e246c1b8.pdf?index=trueIn PDF document text
    • http://xijovapafibowuw.rf.gd/zizevegapipeziva.pdfIn PDF document text
    • http://gagodat.rf.gd/naziki.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_b6cff57bd0f84680b19e4cc45917caec.pdf?index=trueIn PDF document text
    • http://fozijijaraj.rf.gd/the_wave_az_images.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_e4ceebdeade0462687f431915c997f18.pdf?index=trueIn PDF document text
    • http://pipinodojo.epizy.com/kokajarojefetin.pdfIn PDF document text
    • http://foliminuga.epizy.com/que_se_necesita_para_realizar_un_traspaso_de_una_moto.pdfIn PDF document text
    • http://pakebixulo.epizy.com/kinixitakonalesexuragi.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_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 5152 bytes
SHA-256: cafbb5a0fed7801c2820b3ff3011748dcf1bb3ce32b9a671d19af016c63103f3
font_01_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 11004 bytes
SHA-256: 8bfc9eeaf0a5f2fa2b66ba430fd758f558c2c55ababcab5b02719c20b0d71e32

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