Malicious PDF — malware analysis report

Static analysis result for SHA-256 7227b8eafe76ece9…

MALICIOUS

PDF

33.4 KB Created: 2020-05-17 09:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88c48d6f1b2ac66be58ef750f87a0eb4 SHA-1: 77d061e3bde8411371959803fe92f6cb8ada6670 SHA-256: 7227b8eafe76ece90e0118e51656e4f15dcd60dcce1118a46ff75cd998b0ce54
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of numerous suspicious URLs points towards a malicious intent. The document body itself is heavily obfuscated and contains embedded URLs, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://architecturallandmarksus.com/uploads/1/3/0/7/130774969/130774969.html#calcium+oxalate+kidney+stones+pdf
    • http://meridianintranet.com/uploads/1/3/1/4/131406020/wisolo_koxefazukosi_guforediwo_manen.pdf
    • http://blufftonchurchofchrist.org/uploads/1/3/1/4/131408502/detelip-woxirude-xoridimefupikoj-metulejewi.pdf
    • http://legendssportsbar.net/uploads/1/3/1/1/131164488/sagimabulif.pdf
    • http://stgeorgebt.com/uploads/1/3/0/5/130543813/9652932.pdf
    • http://lgifarms.com/uploads/1/3/1/4/131437375/rubavotef_xarofe_refaweg.pdf
    • http://loudesigns.net/uploads/1/3/0/5/130551429/2461703.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005792.bin
eec014240e50be343bf507b37c8acc67608b7ec6b60f1148e86e09e89bf52fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5792 10356 bytes

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