Malicious PDF — malware analysis report

Static analysis result for SHA-256 841a97db3f365b3b…

MALICIOUS

PDF

43.1 KB Created: 2020-11-06 23:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8b6e6cb87bb2035cfec4a8eb5c3ed101 SHA-1: 16d6d4fa70c96f6069a77c93785b962cc1773055 SHA-256: 841a97db3f365b3b8f3d932a524d25446fa49e89634e95f82c20dcee53679925
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://trafficel.ru/123?keyword=watch+star+wars+episode+2+123movies PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/el_libro_negro_de_las_marcas.pdfIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/69200380385.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/zomaruwonibegefamodogave.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/98480501498.pdfIn PDF document text
    • https://lokepirofav.files.wordpress.com/2020/11/doroxefetases.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/fizimobaruweboratiweti.pdfIn PDF document text
    • https://tuxabavijig.files.wordpress.com/2020/11/37940387668.pdfIn PDF document text
    • https://tobaluli.files.wordpress.com/2020/11/cisco_catalyst_3850_switch_ios.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://wuzapadi.files.wordpress.com/2020/11/53177021903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50dc85fd-40ba-4b48-99fb-ca074f3f5972/technics_sl_qd33_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/data_analysis_using_regression_and_multilevel_hierarchical_models_gelman.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_off0000699d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x699D 5792 bytes
SHA-256: 377770cf593d3ab025fa33cfc3961c44d1dd50e951a2c65a812d00d0852d4f61
font_01_sfnt_off00007d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4E 9932 bytes
SHA-256: 80e1b6c5a419990d4af3b25ed70de4d68d8ad693f09758cb8e897eb51d6410d4