Malicious PDF — malware analysis report

Static analysis result for SHA-256 880401c07a10322c…

MALICIOUS

PDF

78.5 KB Created: 2021-01-06 08:58:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d23e12b363ba57c9079728a5f9e7c9b7 SHA-1: d333c2f59fc82ad6a35c9352cb1edd2dfab2b563 SHA-256: 880401c07a10322c1bbfabce2f53e2bbe53b0905d2a614792f77a99d57d2544c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF_URI and PDF_SEO_LINK_FARM heuristics indicate a pattern of directing users to external resources, which is a common precursor to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=las+reformas+borbonicas+economicas PDF link annotation
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/safezoxezerigero.pdfIn PDF document text
    • https://malugula.weebly.com/uploads/1/3/2/6/132695531/lufipikilanaro_vumodixa_selorozifa.pdfIn PDF document text
    • https://kinijanara.weebly.com/uploads/1/3/4/5/134585029/bejoxap.pdfIn PDF document text
    • https://dafanifupo.weebly.com/uploads/1/3/4/6/134645493/vixozezezaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406191/normal_5fec191b3b680.pdfIn PDF document text
    • https://pasabegimukug.weebly.com/uploads/1/3/4/2/134265340/xomotiz_tudig_sovujunu.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/3449483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367921/normal_5fc4b85188480.pdfIn PDF document text
    • https://lovevisop.weebly.com/uploads/1/3/1/4/131410094/tajajefoji_ramoko_miraja.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/kasuwevovog/81986856726.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/worksheet_on_birds_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf0b75d-bb06-4b13-b021-c69726ee077d/john_deere_x485_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/8278485613.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/wivira.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_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 5076 bytes
SHA-256: e86a10264928081f782343194e9a2eb6386f094cecb5ea34a545ff35be823214
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 11024 bytes
SHA-256: 32be861bda25172fc62579ddb9f741a0c913ccddde3c29b76ca6c8cda92dd1ad

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