Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc91468838e56a78…

MALICIOUS

PDF

28.7 KB Created: 2020-06-15 23:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 778f4e457b5952d1b74a83c23131c8b8 SHA-1: 766099df8c316240c10e48710804e99015c3a509 SHA-256: dc91468838e56a7853fe7d344ea7a57f654ebcfb9ecd395fc68a21ac091c1484
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links pointing to various domains, a technique often used for SEO poisoning or to distribute malicious payloads. The heuristic firings indicate a 'PDF_SEO_LINK_FARM' and 'EMBEDDED_URL', supporting the conclusion that the primary function is to redirect users to potentially harmful content hosted on these external sites. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hostmaster.ingecasteleyn.be/uploads/1/3/1/3/131383475/131383475.html#iec+60439+2+pdf PDF link annotation
    • http://mycartilage.com/uploads/1/3/0/7/130739906/8a63c01a.pdfIn PDF document text
    • http://courageousband.com/uploads/1/3/0/7/130776580/4aeb76ab2f.pdfIn PDF document text
    • http://healingcrystalenergy.com/uploads/1/3/1/4/131453096/dufinofogimeret-fikezakawuvun-matufer.pdfIn PDF document text
    • http://englishtalkhub.com/uploads/1/3/0/2/130289354/fozerubagi.pdfIn PDF document text
    • http://mail.patrixpiano.com/uploads/1/3/0/3/130313670/pefomutedamut.pdfIn PDF document text
    • http://chutze.com/uploads/1/3/0/4/130476429/sovinegigoj.pdfIn PDF document text
    • http://bahamasaugustllc.com/uploads/1/3/1/4/131410939/9773237.pdfIn PDF document text
    • http://sydneypiercymusic.com/uploads/1/3/1/8/131871453/xunarujufudekogawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4841 9380 bytes
SHA-256: f324fdd84520874fd4149d300e5e18a5fdaa86e32293de107051c92f6f41549f

Open this report in the interactive analyzer, or submit your own file for analysis.