Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2838f868ce74e12…

MALICIOUS

PDF

38.1 KB Created: 2020-06-05 01:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e35ef935773def4937209a4a5ecc5195 SHA-1: 99c6908be4720fa03a0db3e4cb6f3db1ab6f389f SHA-256: f2838f868ce74e1254549bd196e2f59cf6f0728d041022bd9e6239b1afe3b32a
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains several of these URLs, suggesting the primary purpose is to redirect users to a network of linked content, likely for SEO spam or to serve further malicious payloads.

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://darrinstill.net/uploads/1/3/1/4/131453544/131453544.html#dual+family+0.91+guide
    • http://inspirationalmediasolutions.com/uploads/1/3/0/6/130604061/8889617.pdf
    • http://oncarolinast.com/uploads/1/3/0/3/130323277/xipevuwen.pdf
    • http://wholewomansymposium.com/uploads/1/3/0/5/130542940/03b8c4c7eeb.pdf
    • http://pathfindermusicgroup.net/uploads/1/3/0/8/130813934/valukokufeviwaxafu.pdf
    • http://securepowerspanning.com/uploads/1/3/0/6/130620964/4789398.pdf
    • http://darrinstill.net/uploads/1/3/1/4/131453544/terms.html
    • http://darrinstill.net/uploads/1/3/1/4/131453544/dmca.html
    • http://darrinstill.net/uploads/1/3/1/4/131453544/policy.html
    • https://gobovejik.files.wordpress.com/2020/06/91323515783.pdf
    • https://bikixaxapu55491205.files.wordpress.com/2020/06/lexijafuzuxizuzasigaj.pdf
    • https://muranutuba.files.wordpress.com/2020/06/sutoropesat.pdf
    • https://vosinumej.files.wordpress.com/2020/06/ralaxofanopamutasemigemox.pdf
    • https://gixerusowave.files.wordpress.com/2020/06/54904920029.pdf
    • https://bejejigijano.files.wordpress.com/2020/06/43811997588.pdf
    • https://kezoguwax.files.wordpress.com/2020/06/vimirakadurabotix.pdf
    • https://rutogusufem.files.wordpress.com/2020/06/76217946615.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_off0000673a.bin
2edf687dd8bca11ebfe9154eadd44f48a23e7b7097574e7c2025a3a3c12c47d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673A 11104 bytes

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