Malicious PDF — malware analysis report

Static analysis result for SHA-256 baeca62de2e51bbf…

MALICIOUS

PDF

183.3 KB Created: 2021-03-16 22:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21315fe458a635f01e7fa18716a1c98a SHA-1: 785bd1920d2f00d56e96ee5ca1ef55d22b8a9dc3 SHA-256: baeca62de2e51bbf8ff43e7a2f4631dfe09bc2a7c45dfbf6b8ad46e51a6b078a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to 'leonvi.ru', suggesting a redirection to a malicious site. The PDF structure and embedded content are indicative of a phishing lure, likely disguised as a technical document to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/123?utm_term=cambium+epmp+1000+manual
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5fe6cd2b1bf17.pdf
    • https://cdn-cms.f-static.net/uploads/4366313/normal_604d7d7548175.pdf
    • http://zimegubavij.22web.org/wipologuf.pdf
    • https://cdn-cms.f-static.net/uploads/4402956/normal_604016ac3cd3d.pdf
    • https://static.s123-cdn-static.com/uploads/4370064/normal_5fed22f5ebff7.pdf
    • http://xejopegig.mypressonline.com/90886324864.pdf
    • http://lizuzezusad.medianewsonline.com/18130756520.pdf
    • http://janipuwibir.mywebcommunity.org/27504669052.pdf
    • https://cdn-cms.f-static.net/uploads/4450039/normal_603882068d31c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_3156a34f225e433c89fa438dbd7f714d.pdf?index=true
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_f46b3d38d0b24ee8bf567003715baec6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1e11f1f0-69fb-4755-b94d-da68a8941446/fusanopibipemivurekerusep.pdf
    • http://vovogejezubu.rf.gd/alesis_dm5_drum_kit_for_sale.pdf
    • https://s3.amazonaws.com/dowadotiju/brother_se_270d_price.pdf
    • https://uploads.strikinglycdn.com/files/eb1e6490-3d0a-43c4-b38a-4c1514e8ecb6/behaviour_support_plan_template_victoria.pdf
    • https://s3.amazonaws.com/dorobukasawituw/xuzinaruzamatinifonafik.pdf
    • https://s3.amazonaws.com/wizidimawag/riwedesogal.pdf
    • https://uploads.strikinglycdn.com/files/cdcff192-3bda-4f48-ba20-79569de6ed90/25018493742.pdf
    • http://babakijen.epizy.com/la_charca_manuel_zeno_gandia_resumen_por_capitulos.pdf
    • https://s3.amazonaws.com/tufitijinexu/booster_pump_set.pdf
    • http://jupanev.epizy.com/55787096452.pdf
    • https://s3.amazonaws.com/nazekisigiduz/thinking_skills_worksheets_for_grade_7.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000290c1.bin
0421d82b0451b84d9687e72d45bfafaa107dd5f06449994ab9f8de86c01103e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x290C1 4932 bytes
font_01_sfnt_off0002a176.bin
1e15a12f71a2d461d8761ecad0e79489ec11b4d1f6b033c4a5c1a929f5394110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2A176 13356 bytes

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