Malicious PDF — malware analysis report

Static analysis result for SHA-256 37681b9411bc2c20…

MALICIOUS

PDF

62.2 KB Created: 2020-11-14 07:30:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 69bbd4b868ea12984e0a3139c6dff948 SHA-1: 543f40fa5acda7654bf962b495796b72d18982c9 SHA-256: 37681b9411bc2c20b59cf4249c9ab6c5dcce193a64b002b4f723034e67463147
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL points to a suspicious domain, suggesting it's a lure to an external malicious site. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URI.

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://trafftec.ru/123?utm_term=2.5+qt+mixing+cups PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5faee2f0516a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f9ed8dd9fe67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475203/normal_5fa506cbbe6c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_5fa6e32b5969c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422367/normal_5fa9d102aa819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_5f9427c6e95a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415045/normal_5f9ab102a9067.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a057d439-0e3a-4c49-93ad-e5061e24172c/solving_linear_systems_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fec0d4f2-312e-4136-9aa2-fda902eb1cdf/joxisuvojisawukojanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d2fdb94-3f62-4fa2-b5ce-ec557a31cbaa/xivexulilifije.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/centripetal_force_derivation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb588d0d-cf5a-44ab-b56f-a4a8e1166e91/wizard101_zafaria_crafting_quest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018724fb-8d1e-45c4-ba15-841a9fc8592c/71312880593.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/application_airdrop_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c96c1af-c968-414c-b271-6b407ff64549/how_to_draw_a_baseball_glove_video.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/avengers_age_of_ultron_putlocker.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC41 4956 bytes
SHA-256: c3103d21af5f72fcb6af934b78ce50104c93c58aa60c9550e73a9efcf8d4b988
font_01_sfnt_off0000bd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0F 9676 bytes
SHA-256: a80fa85eb9f463bbf1f26d10b93f0b6f905503e1c43f64d1660ca0fccaacf482
font_02_sfnt_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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