Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d2ca57979111c9…

MALICIOUS

PDF

43.2 KB Created: 2020-11-09 03:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4aee173e27467abe9f3fed4dcd495cee SHA-1: ddea6d278a507eaa8c8830f6c87475d19057ade4 SHA-256: a7d2ca57979111c99c97023b76c866bf037f3ab007dcedecc49d434346b80d60
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://traffset.ru/123?keyword=words+beginning+with+she PDF link annotation
    • https://dujodorenenap.weebly.com/uploads/1/3/4/4/134488447/fdd9737102d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_5f8d90097faf4.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/83282a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f87612544926.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/edeec8f4-7293-4d46-8ae6-0c9edb5c5f1a/89683298688.pdfIn PDF document text
    • https://fetigawopazo.files.wordpress.com/2020/11/pepumetoziwizosuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38c31dd-9844-49e6-bfe4-0f11414a99e7/pest_control_notice_letter_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/phonetic_transcription_exercises_with_answers.pdfIn PDF document text
    • https://vowewefu.files.wordpress.com/2020/11/tratado_de_cardiologia_braunwald.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe164e69-10b3-4bb1-8992-7e895921a223/vekitowopozesumakimixe.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/29490661568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6207b536-c548-4c28-93c1-0c62fb0445d2/89065668306.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_off000069d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D6 5088 bytes
SHA-256: 24c217ec16ce8ddcc4f33b1c28cdfa249893835971b3bcebf95ecb2ee7c6faa1
font_01_sfnt_off00007b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B39 10944 bytes
SHA-256: 000b9fc5e2578c20aa345886845cc1756978e242ec610bbada26edb1f59309be