Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f51ffb6bdacbaa…

MALICIOUS

PDF

77.6 KB Created: 2021-04-19 21:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a76b09d0ecb78dff04869d9e75abd1a7 SHA-1: 6a0647befe7e9c3d0e252b8cb81c535ba701daf8 SHA-256: 67f51ffb6bdacbaaa0c64eb0036252763742019cec855b22f11640c16dd7bf3d
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The ClamAV detection further confirms its malicious nature, flagging it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to educational content, likely to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=basic+5+paragraph+essay+graphic+organizer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501229/normal_6023f723bb499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5fc67d20b161f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5fd2528d87789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_601968f241bbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_5fc82fcf1c6f5.pdfIn PDF document text
    • http://phrensy.co/the_universe_next_door_new_scientist7bkmw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_604d0d0545236.pdfIn PDF document text
    • http://pay-order.info/mix_design_methods_for_asphalt_concrete_and_other_hot-mix_types_ms-2sdfhb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_601fbc432246c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366627/normal_5fff7ee1898a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461202/normal_5fe1956f07f92.pdfIn PDF document text
    • http://bottlechainworld.com/bosaxabu5w8i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464311/normal_5fe35f908da94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485935/normal_605503b9e6e54.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/e67c3325-9f54-4c89-92a7-0904ce7fc9b3/leadership_quotes_brene_brown_dare_to_lead.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/bosch_es_4-1m_wir_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/orthographic_projection_exercise_4_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/manual_de_conducir_en_new_jersey_en_espanol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d92d44e1-e290-4266-9021-69bc98264f53/grohe_shower_faucet_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/casio_fx-300es_plus_show_decimals.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_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 5488 bytes
SHA-256: f3cdcbc4f2e7130ac7816c017c046010571a7d3cc0fa887b68cf6232c85bf6a3
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 10544 bytes
SHA-256: 9459856b358d7ed54175084a5ce7411d19eb1dc08b9826eada3c82fe739f8a95

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