Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b4f6257ae07681…

MALICIOUS

PDF

81.8 KB Created: 2020-04-06 11:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3087ed17211e659d4700126a30b7ce9c SHA-1: 04d6ee357deae66090c7c6b520247d4d6183adff SHA-256: b8b4f6257ae076815686e5ab52d074fc6a5c9b321c783c12bf0620aaee21c06a
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the sheer volume of external links indicates a high likelihood of malicious intent, possibly to redirect users to phishing or malware hosting sites.

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://mrlawnman.com/uploads/1/3/0/7/130739559/130739559.html#fotos+del+hombre+en+la+luna
    • http://navasotaminerals.com/uploads/1/3/0/9/130969220/nisevesak.pdf
    • http://caritalindstedt.com/uploads/1/3/0/7/130775818/36352d51dbad1.pdf
    • http://okaythatstrending.com/uploads/1/3/0/2/130288481/tobar.pdf
    • http://fersesspecialtystore.com/uploads/1/3/0/4/130483550/1534016.pdf
    • http://irishknucklesmma.com/uploads/1/3/0/3/130324170/828981.pdf
    • http://pantheraleollc.com/uploads/1/3/0/5/130589151/4199144.pdf
    • http://microphonistbeats.com/uploads/1/3/0/4/130489080/d174c94b.pdf
    • http://scfsfacultyportal.net/uploads/1/3/0/8/130873944/a1f34b75f.pdf
    • http://ptahinitiative.com/uploads/1/3/0/8/130874257/4f42b.pdf
    • http://orlandonsco.com/uploads/1/3/0/4/130483682/litanisixove.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f316.bin
d5c1e36ccacbb4909660932e8e6613c64f98cfcee0866efa979ee46efda26f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10512 bytes
font_01_sfnt_off0001188f.bin
06dd54eedb79d80fda919f91b17fe48c5c5fbbdfb5ab6021b48c0e6a71e31519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 2900 bytes
font_02_sfnt_off000122bd.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122BD 16036 bytes

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