Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc9644c282defb8…

MALICIOUS

PDF

71.9 KB Created: 2021-05-22 16:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 104c63453db4baf8b0abdbbcdd253810 SHA-1: 8102ce1bcd593741e0507ac911ef7ac692b3507d SHA-256: 4fc9644c282defb80d4ce907be962c6340b8ef7cdaa6fd6f7716d3b64cf53595
96 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 an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though partially garbled, suggests a lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://baarspo.ru/strik?utm_term=cap%25C3%25ADtulo+3+en+clase+y+despu%25C3%25A9s+vocabulario+1+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447916/normal_602017a75fab3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5ff61df30f68c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_6054fb6654da7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415045/normal_5ff48d32206c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_6046257f5b83f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458407/normal_600212a7b54b8.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/e6dbdc5c-c3c3-45e6-bd75-d8069712a421/jonigegalok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd32262-7665-4852-b2e6-3072c1597cde/how_to_lock_black_diamond_spot_headlamp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36fa5737-56e9-43b1-aec4-bd92c0efc954/90532940205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257ae056-33b1-437f-8100-61e4cf9647b6/35164766191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3874c8ce-45aa-4566-a39d-c6172dc15ac3/kegojol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/520693ea-1bbd-4e62-b606-3112bec92349/the_idiots_are_taking_over_bass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f734ab1-f651-4103-9325-a49045e8b00f/how_to_get_a_nike_basketball_sponsorship.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/coterminal_angles_worksheet_doc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84aadbed-85ae-4e0f-94eb-b9b9f888499f/what_it_means_to_be_as_wise_as_a_serpent.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/89888430764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1975ab6b-7d1e-4708-b7c9-f482afec269e/new_rules_of_lifting_supercharged_results.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da33de72-a459-4560-9e08-61fa87ec8554/87684638.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/sosajagapenatutopanovido.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/22797241164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f3d39bd-db3d-4764-99c1-a35b4e9fcdee/craftsman_2800_psi_pressure_washer_carburetor_diagram.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_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 5840 bytes
SHA-256: a7dbbb322fa0ac6677dcd8455e059a4694ada0d574b5c84f9e39c2d9a1123563
font_01_sfnt_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 11264 bytes
SHA-256: 76029a436871aa79a7d715b43a10ed865447710e85fa6e3d8a2f47d1d644050a

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