Malicious PDF — malware analysis report

Static analysis result for SHA-256 e998b75361059f45…

MALICIOUS

PDF

48.4 KB Created: 2020-11-07 15:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e1f7df1ff90082e087d2934436e380ce SHA-1: 5c58718fb2e7508ef0f1b45d98cd72d1ed4865d9 SHA-256: e998b75361059f45bdfd0748fe2f5fe8900ebd08f380e77a00be88229ab5758b
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 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=atlantic+ocean+habitat+animals PDF link annotation
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/jubife_mokupufafefudus.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/lalijesawuziwuloge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_5f992d2b39185.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://butizimi.files.wordpress.com/2020/11/24974641175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f08d563-1679-417c-99b0-7ec31726b3fe/10767729608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78883de8-fcf4-466c-8365-d83a39353946/fiwasipukel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a868b6f2-95fb-496a-878a-2a0e09883429/galuzitux.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/mortal_kombat_komplete_edition_krypt_list.pdfIn PDF document text
    • https://wafaruk.files.wordpress.com/2020/11/nys_lcsw_exam_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/bimejerafijemukadenubufiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1d7ae1-eff2-49e2-931f-3666e32c81e7/kenpo_karate_belts.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6183 5072 bytes
SHA-256: aabfa635c9289a6155eb47015912042b79ba0a3dc6118b023fe6b0b6b785d6ae
font_01_sfnt_off0000729c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x729C 10220 bytes
SHA-256: 8cc7edc29bbb7fb6c54bceab415c79dcfb5a3f0df21dd6f0d243cf0dab4bb5bf
font_02_sfnt_off000095bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95BC 19392 bytes
SHA-256: 40f28130f37efcb063f74e6ddcf5d18ec564bc4e5366d40e4a419e2a5fc8d2ca

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