Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2a967dbc9ed7bd…

MALICIOUS

PDF

48.9 KB Created: 2020-04-16 20:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4f8ea1f71fb1d5e7929607e83723f69 SHA-1: cd0aca04a95718d5e427dad97d8c74cb92d0381f SHA-256: cd2a967dbc9ed7bdb63239ced898e4ab8d4449d46f6875351085c4424e5e8adc
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure.

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://liveyourlight2020.com/uploads/1/3/1/3/131380263/131380263.html#balancing+chemical+equations+problems+with+answers
    • http://lhaframing.com/uploads/1/3/0/2/130289793/2639400.pdf
    • http://nurtureyourgrowth.com/uploads/1/3/0/8/130874567/tovizapuxegu_temegakuvixa.pdf
    • http://ipouronline.us/uploads/1/3/0/7/130738994/8198403.pdf
    • http://kevinaoquinn.com/uploads/1/3/0/7/130775950/gadegasagurali.pdf
    • http://massagewestborough.com/uploads/1/3/0/6/130603731/gexajafuroked.pdf
    • http://kuhl.wine/uploads/1/3/0/7/130740387/5423340.pdf
    • http://kman-turbo.de/uploads/1/3/0/3/130379081/dawogovisegirut_kisetikeg_fituwewanuput_navek.pdf
    • http://justonekid.org/uploads/1/3/1/4/131437839/kidetirezewav.pdf
    • http://bfebids.com/uploads/1/3/1/4/131437107/6a6051.pdf
    • http://hommagenutrition.com/uploads/1/3/1/3/131380901/1148789.pdf
    • http://bfebids.com/uploads/1/3/1/4/131437107
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b80.bin
b25e383dbeb15ac5a7c32d7ddcc71940de7f39c70b1342795af6fd4f18c26cd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B80 8496 bytes
font_01_sfnt_off0000ac8e.bin
fe0dcda944e996aec996b560eb0dea605385280f05f6b493a918879507a9d0ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC8E 2908 bytes

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