Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b26e3f657fab747…

MALICIOUS

PDF

38.1 KB Created: 2020-06-11 19:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1abfc30f3c69617c9bde0db4bcd887e3 SHA-1: 666500b288fd9aeb6071ee0b3da15636000f4a0e SHA-256: 2b26e3f657fab74738409221cb382cacd04a45005f01741f57e98fa5e3076d68
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, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to these URLs. The primary purpose appears to be directing users to a network of websites, likely for SEO spam or to host further malicious payloads. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://1cj.undesirable.us/uploads/1/3/0/7/130775471/130775471.html#etiquette+lessons+for+middle+school
    • http://mail.velvetmilitia.com/uploads/1/3/1/1/131163836/vavasibiko.pdf
    • http://sasikmoon.com/uploads/1/3/0/9/130969652/224788.pdf
    • http://gouverneurmontreal.devsite-1.com/uploads/1/3/0/5/130588500/bilixuxoxanetij.pdf
    • http://desertcharmweddingcoordination.com/uploads/1/3/0/5/130588256/tajugaxisurotej.pdf
    • http://stlsportslab.com/uploads/1/3/1/4/131437317/faxivojikaxav.pdf
    • http://mail.dolphinvacations.net/uploads/1/3/0/7/130776260/linuwexizaxu.pdf
    • http://leaderwithpurpose.com/uploads/1/3/0/5/130590353/jawonixilivatewoj.pdf
    • http://jamrocmedia.com/uploads/1/3/0/2/130291922/pejij.pdf
    • https://remopar.files.wordpress.com/2020/06/14218750333.pdf
    • https://sosabufuji.files.wordpress.com/2020/06/nagagigilubosow.pdf
    • https://lubokafokazi.files.wordpress.com/2020/06/87752265880.pdf
    • https://kibawof.files.wordpress.com/2020/06/29511845270.pdf
    • https://bobozowino.files.wordpress.com/2020/06/75336011836.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_off00006935.bin
d62d781b4897021bf50e4cd2f3d03aa3f47d0495adf30f91340d34d379cb712c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6935 10444 bytes

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