Malicious PDF — malware analysis report

Static analysis result for SHA-256 7555411323c8785d…

MALICIOUS

PDF

80.1 KB Created: 2021-05-12 16:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c28266861c57f851a471c9466a58e183 SHA-1: 1fa9f453b789c2b90af6c184d3882fb8c1402d59 SHA-256: 7555411323c8785deb6a482da56a9346aa59c69ebfcbb5bffad200c58a11aeff
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary malicious URL being https://ponafet.ru/strik. This suggests a phishing or content redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=howard+gardner+multiple+intelligence+test+excel
    • https://cdn.sqhk.co/tubawonidas/ggCIjhB/1573391273.pdf
    • http://jaxagogilexet.sportsontheweb.net/55063295491.pdf
    • http://raguvigawak.mypressonline.com/jisanedijabavuboda.pdf
    • http://bufibinokurun.scienceontheweb.net/85340866889.pdf
    • https://cdn.sqhk.co/kitaparek/0bSbjeY/best_movie_catalog_app_for_mac.pdf
    • https://cdn.sqhk.co/pibepufas/jbFLHrF/tixibokopalewuginomelunof.pdf
    • http://fesotisifofil.mygamesonline.org/mezizew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4e9d0828-c0e2-4340-8200-099971d5c90d/93588998242.pdf
    • https://uploads.strikinglycdn.com/files/1b7a4170-3415-4af4-b419-a11dea627885/stihl_ms180_chain_file_size.pdf
    • http://vejebuta.rf.gd/alcanos_propiedades_fisicas_y_quimicas.pdf
    • https://24b051fc-04af-4e2d-8b9e-4e75c06063ec.filesusr.com/ugd/1a488c_ef7e819df01d4e1d9b45fb10c0d7505c.pdf?index=true
    • http://tawurogaxe.epizy.com/fepaxu.pdf
    • https://uploads.strikinglycdn.com/files/56d50cb7-03c8-47bd-9b84-e20d2652b3a8/the_knife_of_never_letting_go_sequel.pdf
    • https://uploads.strikinglycdn.com/files/ebd12e6f-aa82-4cd2-9f43-fc87d0ecbdbf/mechanical_engineering_gatech_tutoring.pdf
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_b34ccfb413d7485c8b147dc58e9a7431.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0e3cd408-a926-48a1-9b28-65565970d15e/api_570_inspector_job_description.pdf
    • https://uploads.strikinglycdn.com/files/83360d7a-929d-48cb-bd8c-3f5f9b7c1984/92851912999.pdf
    • https://uploads.strikinglycdn.com/files/df68b2ea-bc09-4153-81e1-6e8241d64c13/lidoxekolil.pdf
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_cb9a01f356f643919aa75e6d84760371.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0908ac11-c82e-4e7c-955b-e7b223b906e4/31483693580.pdf
    • http://bumurulepowele.myartsonline.com/apple_ipod_shuffle_4th_generation_waterproof.pdf
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_c835cfc1e8a443158ef8431f2477dde4.pdf?index=true
    • 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_off0000fa42.bin
437d59778e8cc44a5d3b4d9ee638c3f601c6ef8f07cfaa7d7aa7562831bace53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 5512 bytes
font_01_sfnt_off00010cff.bin
c48a182e5fe51328f8d9f066feff00d16dc9d15e2f951d2d8d80ac30636a9c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 11076 bytes

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