Malicious PDF — malware analysis report

Static analysis result for SHA-256 9757184fa9d15b9b…

MALICIOUS

PDF

73.6 KB Created: 2021-05-10 21:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2dc342e620ea04aba10a1c128e2e2891 SHA-1: b5f5ad78ede7fc5b2b624fc30746f547eca1fe75 SHA-256: 9757184fa9d15b9b3b617bcf4df5538c73b0f501f1adf9bd3fde90021c3f6b00
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9999

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://baarspo.ru/strik?utm_term=john+deere+d170+mower+deck+belt+diagram PDF link annotation
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/438e86.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/xifuxas.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/tamujefewejagagatini.pdfIn PDF document text
    • http://moxipafuxoxo.mygamesonline.org/gajib.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/fMrrgev/50547543719.pdfIn PDF document text
    • https://kefavemi.weebly.com/uploads/1/3/4/0/134042724/8084615.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/jhegiE9/97872737727.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/20040869826.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/perurulexi/71326394134.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/az_cardinals_2018_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/in4mo_task_reporter.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/tipos_de_grupos_sociais_sociologia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/818fda01-d6a7-44b3-af1e-6c736b700743/rehras_sahib_in_punjabi_written.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3568bb88-8749-4be5-87f5-e0f6fa4341b3/tl-wr841n_setup_as_access_point.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/game_of_thrones_intro_music_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/lafiwepedunoxukinata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548410b3-99dd-4051-a388-1e2b8ba95039/fesuzav.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/kefakazabupuladojilazu.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_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 5736 bytes
SHA-256: 741a2046ec6a5eae3598dda8522c3a9bf82d20f5c98f7e7ee57ccd121189c9df
font_01_sfnt_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 10860 bytes
SHA-256: 0dce59fc934303469559b9c2946fe617d3c76832c211a4cdec81d042c3515a9e

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