Malicious PDF — malware analysis report

Static analysis result for SHA-256 a976344f621624be…

MALICIOUS

PDF

37.3 KB Created: 2020-06-02 16:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f9083c688e63bc49650c5b08db30aaa SHA-1: fcf73daaa3f9118a4ae5a3c3e916854077e48621 SHA-256: a976344f621624be6925d49dc6038db125996b07d6142fff23bc4c50721df756
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also listed in the extracted URLs, suggesting a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wfhhustle.com/uploads/1/3/0/6/130639854/130639854.html#the+chrysanthemums+by+john+steinbeck
    • http://pastortarcisjose.com/uploads/1/3/0/4/130475966/kumaj_feserego_pomed.pdf
    • http://nspiritcoaching.com/uploads/1/3/1/4/131453630/wazaj.pdf
    • http://158west.com/uploads/1/3/0/4/130483773/nubakujejone_xivajupudeda.pdf
    • http://wfhhustle.com/uploads/1/3/0/6/130639854/terms.html
    • http://wfhhustle.com/uploads/1/3/0/6/130639854/dmca.html
    • http://wfhhustle.com/uploads/1/3/0/6/130639854/policy.html
    • https://korimugi.files.wordpress.com/2020/06/61015707920.pdf
    • https://fatafujuk.files.wordpress.com/2020/05/pukorixomivodovukorobewe.pdf
    • https://potiniwuvo.files.wordpress.com/2020/05/lixipobuveviguzifegubim.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_off00006925.bin
538f38a9beb03bacea03fa85d9a37a69c6c05cd45fddcc5ff871b47c99187e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6925 9864 bytes

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