Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03bab436b234fde…

MALICIOUS

PDF

35.2 KB Created: 2020-11-05 18:19:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1bd4d66dbf7903bb20948e29e76b8c9d SHA-1: 942bded085de276336f0f2ed70b367aa6525e813 SHA-256: f03bab436b234fde900039b9304bb7ae341ada1bac9d639e933f3cfc3391a15f
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffnew.ru/123?keyword=combination+and+permutation+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417537/normal_5fa10aefe3ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_5f915a4ed7c43.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/pogamawo_nesopabim_pipufixisizef.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/palaj_xofepevez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5f974cccbbf20.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/jebupofedijakuk/biology_laboratory_apparatus_and_their_uses_with_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/devi_argala_stotram.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/attendance_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/tv_guide_jackson_ms_comcast.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_off00004d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D30 5452 bytes
SHA-256: 75236b20a242390b93414160fa8e7572fa4c68121e9b268c7a68f476d15fc6b5
font_01_sfnt_off00005f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F98 9540 bytes
SHA-256: d98858439a1a2706666f17e5409a6a9e0915d2bbfa016911d7ff02d87cc5d6fb