Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87518dd260f9457…

MALICIOUS

PDF

33.9 KB Created: 2020-05-16 12:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e634c3d2c3245e0194da6228d3062ff1 SHA-1: 913f4c0020cd46d86435e8323c3525cf4b6703dc SHA-256: c87518dd260f9457a822b6dfe8b803dca6dfcd36ead3c3c0ab5dc878012b31df
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, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list, reinforcing the link-farming attack pattern.

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://urbanvertical.ca/uploads/1/3/1/4/131437476/131437476.html#coenobita+clypeatus+care+sheet
    • http://420edible.net/uploads/1/3/0/7/130738615/7481553.pdf
    • http://learnchemapp.com/uploads/1/3/1/1/131164273/saxuregituke.pdf
    • http://seanachaidhconsultants.com/uploads/1/3/1/8/131871535/bd5c257fb3c.pdf
    • http://thevillagrovehome.com/uploads/1/3/1/3/131380109/tajemap.pdf
    • http://savethelobster.org/uploads/1/3/0/4/130479312/d8f94c38a2fa.pdf
    • http://naturalfitnessvt.com/uploads/1/3/0/8/130874668/3788954.pdf
    • http://nocoboatcharters.com/uploads/1/3/1/3/131383694/kowosabemone.pdf
    • http://sondraslifesavers.com/uploads/1/3/0/5/130550912/rowotugevegote.pdf
    • http://rdivineshop.com/uploads/1/3/1/0/131071308/c6aaee16ee87.pdf
    • http://deltazetaysu.com/uploads/1/3/0/7/130774994/9a07b5556f262.pdf
    • http://alisonic.net/uploads/1/3/0/5/130589393/rubalozumeda.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a03.bin
bd4a0f19cf27ed080f1fc4b5665e0e0aa00ec941f0ea4f5ee594183b20fcae9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A03 10124 bytes

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