Malicious PDF — malware analysis report

Static analysis result for SHA-256 c425834636225aa1…

MALICIOUS

PDF

55.9 KB Created: 2020-03-20 06:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: b2d471816e04085216be790f32b47f7b SHA-1: 1434414c33da70c5416a723721ef2c387a4fc9de SHA-256: c425834636225aa1bb59176e0221f32d558354ce71731821a78a8c665cb1c24b
136 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs pointing to external PDF files across various domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests an attempt to manipulate search engine results or redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and URL distribution point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://wwwgippslandfibreglass.com/uploads/1/3/0/2/130272940/130272940.html#equipo+para+cimentaciones+profundas PDF link annotation
    • http://byshannonmalone.com/uploads/1/3/0/6/130620964/tonexo.pdfIn PDF document text
    • http://www.nkeysjewelry.com/uploads/1/3/0/9/130969179/zatideralizijekigak.pdfIn PDF document text
    • http://refugechurchva.org/uploads/1/3/0/7/130739917/duwerukopa.pdfIn PDF document text
    • http://paracordgal.com/uploads/1/3/0/5/130590431/689846.pdfIn PDF document text
    • http://www.legacyhairco.com/uploads/1/3/0/2/130272365/9992390.pdfIn PDF document text
    • http://divine-beloved.com/uploads/1/3/0/2/130287965/vusaneburososomafo.pdfIn PDF document text
    • http://pearlsandcurlsboutique.com/uploads/1/3/0/4/130435783/gogan.pdfIn PDF document text
    • http://www.synergyspoonflorists.com/uploads/1/3/0/7/130775310/01e990735c6c.pdfIn PDF document text
    • http://frontjunk.net/uploads/1/3/0/5/130590353/4336964.pdfIn macro / runtime command snippet
    • http://veticusllc.com/uploads/1/3/0/4/130488169/zulijanutewuk.pdfIn PDF document text
    • http://technobrain.company/uploads/1/3/0/5/130541552/xipizogasumozigan.pdfIn PDF document text
    • http://www.sleepfocusedsolutions.com/uploads/1/3/1/0/131070612/6751609.pdfIn PDF document text
    • http://crm-advisors.com/uploads/1/3/0/4/130476272/zazemetexef_vifivabaf_gajibejafoduwe_wotemotisoromi.pdfIn PDF document text
    • http://mta-sts.mail.wedoofficeinsurance.com/uploads/1/3/0/8/130874123/najegibegumaven.pdfIn PDF document text
    • http://grossmontorthotech.com/uploads/1/3/0/3/130379342/lojox.pdfIn PDF document text
    • http://jmwhitley.com/uploads/1/3/0/6/130621857/53ccc41d6fc48e.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA63B 1888 bytes
SHA-256: eb8cf970f7fbc00a6c6a3e60a1f2416a280371eb4fe4c509803b0d51b5f2ff70
font_01_sfnt_off0000aedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDD 9116 bytes
SHA-256: 6bb80335393ec7dc04be919262940a60aa5e61939009c7c08e95e99fd9c329cf

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