Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fa88b8768e8f87…

MALICIOUS

PDF

40.4 KB Created: 2020-06-15 02:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a86ec4dfb86373312d4d47646d176ce2 SHA-1: 3291d7d78d245635f0e48eade3172b223dcaee17 SHA-256: 88fa88b8768e8f87e6d6495660278009dc95d59d3bb3367cbbd025390c5a60f5
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a link farm. The ML classifier strongly indicates maliciousness. The primary attack pattern involves directing users to a multitude of external PDF files hosted across various domains, potentially for SEO poisoning or to serve malicious content. No scripts were extracted, but the presence of numerous external links suggests a watering hole or content distribution strategy.

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 http://mta-sts.mx.jlinco.com/uploads/1/3/0/6/130621829/130621829.html#a+textbook+of+optics+s+chand PDF link annotation
    • http://bootycamp.se/uploads/1/3/0/6/130621698/boxevela_pedumuwowukov.pdfIn PDF document text
    • http://spassocafe.id/uploads/1/3/0/7/130740242/4278757.pdfIn PDF document text
    • http://aliciabrockway.com/uploads/1/3/0/6/130620302/wixexiziwepet.pdfIn PDF document text
    • http://animatorfun.com/uploads/1/3/1/1/131163977/posuxi-fubomilitonem-wubikenipexo-powokewa.pdfIn PDF document text
    • http://workshoplevel.com/uploads/1/3/1/3/131380745/xikiw-mitamo-pafupitexolipor.pdfIn PDF document text
    • http://ready-set-speak.com/uploads/1/3/1/4/131413550/4583000.pdfIn PDF document text
    • http://sonasap3930.com/uploads/1/3/1/8/131856602/gawofivugoto.pdfIn PDF document text
    • http://mx.danielecastelgrande.com/uploads/1/3/0/4/130476589/voxawesido_bamilirinagaza.pdfIn PDF document text
    • http://trademasters.designpreviewer.com/uploads/1/3/0/7/130740003/pewosezujurusuzasobe.pdfIn PDF document text
    • http://hostmaster.winefest.ca/uploads/1/3/1/0/131071057/wigesolup_mologama_kinusenu.pdfIn PDF document text
    • http://bubblingbrinebrothers.com/uploads/1/3/0/2/130289467/wuzijebujuraroboxe.pdfIn PDF document text
    • http://treeservicessc.com/uploads/1/3/0/4/130476242/lokon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nojisaxopo.files.wordpress.com/2020/06/bilufux.pdfIn PDF document text
    • https://subujitupus.files.wordpress.com/2020/06/kogofag.pdfIn PDF document text
    • https://bigobiguba.files.wordpress.com/2020/06/1510761765.pdfIn PDF document text
    • https://guzubuxokom.files.wordpress.com/2020/06/furadamegatixovafuv.pdfIn PDF document text
    • https://tamanalewoja.files.wordpress.com/2020/06/wabonaxalavavexenuli.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8E 10104 bytes
SHA-256: 01d9f4ee7c9e8b5e9e8e5a9776decdef95935a05cda6840200dc13abed4f7615
font_01_sfnt_off00007e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E28 16844 bytes
SHA-256: 8d895e0ef440a72b60e96a9dedf4e7758cd1148ce3490ddf701ec694b59a5371

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