Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f31cafaf6e7cf58…

MALICIOUS

PDF

78.1 KB Created: 2021-06-03 02:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 503606401b67cf1569c5676f4cfd7c77 SHA-1: 5689ddca05d63ac92f759fc6ec32a3936cd6a778 SHA-256: 3f31cafaf6e7cf5864ca33f9d59e8f8963017ae55fb5342a897b5ee85038e55b
96 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating the presence of external URIs. The embedded URLs suggest a phishing or social engineering attempt, likely to trick users into downloading further malicious content. No scripts were extracted, but the PDF structure itself contains malicious indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/pbw?utm_term=english+conversation+with+hindi+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417306/normal_5fc8ea9b7e473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_6037d03ebb0d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393755/normal_5fe0a7f020801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461219/normal_604b8fee10161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423133/normal_6005b067a7536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_602d7585e240b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497688/normal_5ffbd83760258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_604e82df04684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_60488bf571b82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fd038c295909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_605ceeb9c60b1.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/51907dc8-8d44-42ec-a384-50d8cfa971db/teorema_de_ruffini_factorizacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f46669b-7b42-413a-8ea1-9aff7cd6a5f3/seribir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf82713-1eb2-4450-b099-51f883587abd/25473894969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86bef417-f6e6-40fb-8510-10db90fb4db4/why_am_i_thirstier_than_normal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11b8471-f071-4422-aef9-613a4925a484/48850996355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63faaf8-da3f-429d-a937-6ce4812139f6/bexiwutirinuwodapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74fcd526-1670-4e58-b467-fc11a4d6e7ec/2d_and_3d_shapes_worksheets_for_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9daad298-0564-40f1-91fa-b1aa1931e955/gofikizivaxozix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fdad59a-00d8-41d1-bd72-8fdf5e2d16d0/is_bigen_hair_dye_safe_to_use.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_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 5528 bytes
SHA-256: a21f90fab213d612ee01f2dd5442d964329e851c5adf8d97199dbb948b2531b2
font_01_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 10700 bytes
SHA-256: ad14affa53d5b422b6d6bca52b48ac9cfac91ba73f3bcdee05c5d93f4da89d68

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