Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfa475c100e8fa5…

MALICIOUS

PDF

67.6 KB Created: 2020-11-08 06:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7df9b4dd223b5ee6f0d64b941e725879 SHA-1: d372dab62899fcd6bca23997595d20f6a42c249d SHA-256: fbfa475c100e8fa5a413fc2dc3b805197035ed773cdd0385b49eac686898af4b
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://traffnew.ru/123?keyword=chemistry+mole+ratio+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f8a9da91edc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_5f87626c4e4e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374710/normal_5f8dfd7040cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_5f97a7b28ece2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_5f9dca73c63e8.pdfIn PDF document text
    • https://vosaxoro.weebly.com/uploads/1/3/4/4/134469305/caba8b0cca67e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f889ca81ecff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f88ba620c329.pdfIn PDF document text
    • https://lopinelu.weebly.com/uploads/1/3/4/3/134369173/3567db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5fa106ffa63a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://nanonekunare.files.wordpress.com/2020/11/dululazapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd420e5d-8f7c-4c16-98c0-4a0a73c6dad6/devudexefujizolu.pdfIn PDF document text
    • https://jisumigeki.files.wordpress.com/2020/11/hack_wifi_id_dengan_android.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC6 5088 bytes
SHA-256: 2b1e51aab7b186f93644948751bca210293974955c81ac49f561c2330e22bd54
font_01_sfnt_off00008cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF1 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off00009854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9854 11356 bytes
SHA-256: e65a7c0cf8eb2e9a0b577d1848a45319f54c9731764feac5b8f18459f0cfd1c7
font_03_sfnt_off0000bf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF54 16292 bytes
SHA-256: e0b66a9658fc6c695e727c8d28cc89f21da481eac440a406730355de4a9b9ee7
font_04_sfnt_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 14312 bytes
SHA-256: 52c80b0061d0abfa6f1d366a1b275cfc14379ba0d563e1a862392a9053f7d07d

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