Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38f58a4b6182b61…

MALICIOUS

PDF

66.5 KB Created: 2020-11-20 23:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2217ecbd5eb989bb8a3a7a02e2df2d38 SHA-1: 2e0c21bffde45746f0157c122bc8e4132a317434 SHA-256: b38f58a4b6182b611c33c0980a42c2a02fb46ca38944a07390a5dcdb3e988b30
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains text that appears to be a lure related to a 'nail polish pen target'. The presence of an external URI suggests an attempt to redirect the user to a malicious site, likely for phishing or a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=nail+polish+pen+target PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419832/normal_5f9d21b5db58e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fa6eed657a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418171/normal_5f99a223eef33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_5fb7b72a60a1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5f999c7cec028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/invitation_to_interview_letter_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/20696214556.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/rf4287hars_samsung_refrigerator_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b5220f-a229-4cff-bdb4-1d58721713b3/st_charles_post_office.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/btec_hospitality_level_2_book.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_off0000c776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC776 5048 bytes
SHA-256: d370ac8dc845ca5447add337ae0cda4a06dbe0fa816bb7ac74dbec953f98c492
font_01_sfnt_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 10956 bytes
SHA-256: 6d0a174e421f5673e4b699abce80463a6c350131c019605f8f5be9551c812a11

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