Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1d1c5fd9f3aad9…

MALICIOUS

PDF

46.8 KB Created: 2020-03-29 13:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8e22efac5da525da0ad470020c068baf SHA-1: 758995d9c8700d602006f57caade8b1f149658e7 SHA-256: 6b1d1c5fd9f3aad9b875c7c51d044b51168c767e774db5650169e188893d158e
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to other PDF documents. The ML classifier strongly indicated maliciousness, and the presence of many external links suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the PDF structure itself is used to host and link to potentially harmful resources.

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://advance-it.net/uploads/1/3/0/7/130739222/130739222.html#cuentas+de+activo+y+pasivo+corriente
    • http://learnenglish5050.com/uploads/1/3/0/6/130621195/baab89fe2330fe.pdf
    • http://thelayeredcrepe.com/uploads/1/3/0/5/130551922/856287.pdf
    • http://dchighlandsweets.com/uploads/1/3/0/6/130639883/nakik.pdf
    • http://gameflu.co/uploads/1/3/0/3/130313405/3230cd3bab.pdf
    • http://myhealinghands.org.uk/uploads/1/3/0/5/130588560/vojilonavaripaseguve.pdf
    • http://accettulli.com/uploads/1/3/0/5/130551434/e961af5.pdf
    • http://moovsterrelocation.com/uploads/1/3/0/6/130639230/xevapenefuta.pdf
    • http://juliespetsittingdogwalking.net/uploads/1/3/0/5/130539097/ludazuv.pdf
    • http://beachcomberstt.org/uploads/1/3/0/4/130476277/14c8e19a5.pdf
    • http://shopdebbie.net/uploads/1/3/0/7/130775583/nuxug_wisogid_rotugagisakelij_lotovubonutedo.pdf
    • http://connorcopelandcreative.com/uploads/1/3/0/6/130621441/f69816de8fd65.pdf
    • http://walkervswalker.com/uploads/1/3/0/7/130776239/sinejerigapovo_zozododexibi_mewexovizisa.pdf
    • http://nathanplant.com/uploads/1/3/0/6/130622101/722c4f020.pdf
    • http://vaporqualitysummit.com/uploads/1/3/0/6/130621587/bigisusiwip.pdf
    • http://distrinalstamarta.com/uploads/1/3/0/2/130292098/48249db39f9a989.pdf
    • http://bpimienta.net/uploads/1/3/0/3/130323415/siluw.pdf
    • http://ifaservices.eu/uploads/1/3/0/5/130589435/nomaxowumu.pdf
    • http://ecolesymphonia.com/uploads/1/3/0/7/130775634/tadajasot.pdf
    • http://living-ceremony.com/uploads/1/3/1/3/131379434/9841f.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_off00008ca5.bin
62a35a6866992b948dd2cba065110b221dd62d3bb7be7abd61810697b784d415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA5 8664 bytes

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