Malicious PDF — malware analysis report

Static analysis result for SHA-256 993f0660ab4d858f…

MALICIOUS

PDF

27.7 KB Created: 2020-05-16 16:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 4e4e53c13d6ffc4f33daf474559a834e SHA-1: 0843ea8f99aa8d086c0c64651740d2475cb0b077 SHA-256: 993f0660ab4d858ff9d0d712e9b08cbbe172b2469a69053e7717c1d611979a90
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to these URLs, indicating they are the primary payload. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://artroom4.com/uploads/1/3/1/4/131483185/131483185.html#aua+urinary+symptom+score+pdf PDF link annotation
    • http://gillisassociates.ca/uploads/1/3/0/6/130639583/3479653.pdfIn PDF document text
    • http://thepureimagination.com/uploads/1/3/0/2/130287291/sukuja.pdfIn PDF document text
    • http://thedallasinstitute.org/uploads/1/3/0/2/130289427/fupimigugoxiluvokux.pdfIn PDF document text
    • http://wendieelovich.com/uploads/1/3/0/6/130604521/d1b09a06.pdfIn PDF document text
    • http://pyrgas.net/uploads/1/3/0/7/130740184/97a030bc408646a.pdfIn PDF document text
    • http://metersnelectronics.com/uploads/1/3/0/9/130969800/xipozapobudakamon.pdfIn PDF document text
    • http://ptjohanostberg.com/uploads/1/3/1/1/131163857/2327350.pdfIn PDF document text
    • http://cwrhoffmann.com/uploads/1/3/0/6/130640179/3f8d6ca9987d.pdfIn PDF document text
    • http://laperezstyle.com/uploads/1/3/0/3/130313123/32a01096b1.pdfIn PDF document text
    • http://ndcca2016.com/uploads/1/3/1/3/131384688/xupivagipes.pdfIn PDF document text
    • http://origintheatrical.com/uploads/1/3/0/4/130476148/binifalamoxo_gimativ.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45E5 8668 bytes
SHA-256: 662cea2842f88bb4ec8517a0bcc7d70bf385eb6cee472b0a149f7f9f66f44476