Malicious PDF — malware analysis report

Static analysis result for SHA-256 9724520570a0fd20…

MALICIOUS

PDF

44.0 KB Created: 2020-11-08 13:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 758e59e303bb3b7294c51e4554f94253 SHA-1: d38d390466ebc107344e4ba2eac7e6dc4eddbbee SHA-256: 9724520570a0fd206414cbfbcfb36846652ac3d95e94a257a0023c66038781b4
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://trafffe.ru/aws?keyword=directv+c41-700+mini+genie+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383295/normal_5f8bfa4891358.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/aeea5898-b0ea-4100-8113-be225cdc051a/mevosuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297e1deb-7577-499a-81f0-1d1898f0d9df/savabigoxibuluduwime.pdfIn PDF document text
    • https://zuwegufu.files.wordpress.com/2020/11/xugopipaxunapenewote.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/vurafujiderujolimagar.pdfIn PDF document text
    • https://misenebefin.files.wordpress.com/2020/11/paxatamewonubup.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/santee_drive_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04146a54-4350-4912-8cf5-e18f00a1b57c/48328660447.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/what_is_hcho_and_tvoc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54db95d0-3283-4878-9aa9-4e6a7c1aa4be/tebevemeworet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab8644d-26e8-41b5-bc87-05d9f1641a1a/mississippi_age_of_medical_consent.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_off00006a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A62 5572 bytes
SHA-256: 7fffb5af1bb58a57191291716068790c32a0789e977d03395a5c601ff9c0ed43
font_01_sfnt_off00007d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D6C 11028 bytes
SHA-256: 3bb0637355907e5d4b73ec068badd4a066e1103b319d68608aeba18a55a55845