Malicious PDF — malware analysis report

Static analysis result for SHA-256 639ef7e299e2c8d9…

MALICIOUS

PDF

33.9 KB Created: 2020-04-29 11:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 75f954af03b9eeff26bfd8e8a0fdd4d8 SHA-1: 7f3ce39d90e54039e0e206ede28f3ca04694dd7d SHA-256: 639ef7e299e2c8d921646fce09d9c14971529a70216cbcfe46ae76a733bf7920
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on suspicious domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs suggests an attempt to redirect the user to potentially malicious content. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://sowellfamilyfarm.com/uploads/1/3/1/0/131070167/131070167.html#work+certificate+sample+pdf
    • http://singletonministriders.com/uploads/1/3/0/7/130775436/5818669.pdf
    • http://topnotchbling.com/uploads/1/3/0/2/130289460/tidagopali.pdf
    • http://blacklovebound.com/uploads/1/3/0/4/130479350/035d2d441a.pdf
    • http://jaxrenovationservicesllc.com/uploads/1/3/0/3/130323803/xenefa.pdf
    • http://shopginaandjason.com/uploads/1/3/1/6/131636725/xumusifirefukiv-fejonejodewawuf.pdf
    • http://beautifulweddinginvitations.net/uploads/1/3/0/4/130483364/4969569.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_off00005b7f.bin
b1e2040a1ad879be27757885242d8f79cf7aba6b96fab1563e8145d819c48ee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7F 7996 bytes

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